diff --git a/Assets/Tests/Editor/NativeCliInstallerTests.cs b/Assets/Tests/Editor/NativeCliInstallerTests.cs
index 0bcb4eef34..279f4a0a76 100644
--- a/Assets/Tests/Editor/NativeCliInstallerTests.cs
+++ b/Assets/Tests/Editor/NativeCliInstallerTests.cs
@@ -22,7 +22,7 @@ public class NativeCliInstallerTests
         [Test]
         public void GetInstallCommand_OnMacKeepsDispatcherCurlInstallerAvailable()
         {
-            // Verifies that editor installs use the dispatcher installer script, not npm.
+            // Verifies that editor installs download the dispatcher installer script and its checksum from the release, then execute it, and never fall back to npm.
             NativeCliInstallCommand command = NativeCliCommandBuilder.BuildRemoteInstallCommand(
                 RuntimePlatform.OSXEditor,
                 TestBetaCliVersion,
@@ -31,19 +31,21 @@ public void GetInstallCommand_OnMacKeepsDispatcherCurlInstallerAvailable()
 
             Assert.That(command.FileName, Is.EqualTo("/bin/zsh"));
             Assert.That(command.Arguments, Does.Contain("-l -i -c"));
-            Assert.That(command.Arguments, Does.Contain($"https://raw.githubusercontent.com/hatayama/unity-cli-loop/{TestBetaReleaseTag}/scripts/install.sh"));
+            Assert.That(command.Arguments, Does.Contain($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestBetaReleaseTag}/install.sh"));
+            Assert.That(command.Arguments, Does.Contain($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestBetaReleaseTag}/install.sh.sha256"));
             Assert.That(command.Arguments, Does.Contain($"{CliConstants.POSIX_SHELL_EXECUTABLE_PATH} -c"));
             Assert.That(command.Arguments, Does.Contain("ULOOP_VERSION"));
             Assert.That(command.Arguments, Does.Contain(TestBetaReleaseTag));
             Assert.That(command.Arguments, Does.Not.Contain("ULOOP_REMOVE_LEGACY"));
             Assert.That(command.ManualCommand, Does.Contain("curl -fsSL"));
             Assert.That(command.ManualCommand, Does.Not.Contain("npm"));
+            Assert.That(command.ManualCommand, Does.Not.Contain("raw.githubusercontent.com"));
         }
 
         [Test]
         public void GetInstallCommand_OnMacDelegatesPosixSnippetThroughSh()
         {
-            // Verifies that fish or other login shells only load environment before POSIX script execution.
+            // Verifies that fish or other login shells only load environment before the POSIX script downloads, verifies, and executes.
             NativeCliInstallCommand command = NativeCliCommandBuilder.BuildRemoteInstallCommand(
                 RuntimePlatform.OSXEditor,
                 TestBetaCliVersion,
@@ -53,14 +55,16 @@ public void GetInstallCommand_OnMacDelegatesPosixSnippetThroughSh()
             Assert.That(command.FileName, Is.EqualTo("/opt/homebrew/bin/fish"));
             Assert.That(command.Arguments, Does.Contain("-l -i -c"));
             Assert.That(command.ManualCommand, Does.StartWith($"{CliConstants.POSIX_SHELL_EXECUTABLE_PATH} -c "));
-            Assert.That(command.ManualCommand, Does.Contain("tmp_script=$(mktemp)"));
+            Assert.That(command.ManualCommand, Does.Contain("tmp_dir=$(mktemp -d)"));
             Assert.That(command.ManualCommand, Does.Contain("curl -fsSL"));
+            Assert.That(command.ManualCommand, Does.Contain("sha256sum -c install.sh.sha256"));
+            Assert.That(command.ManualCommand, Does.Contain("shasum -a 256 -c install.sh.sha256"));
         }
 
         [Test]
         public void GetInstallCommand_OnMacPropagatesInstallerDownloadFailure()
         {
-            // Verifies that editor installs do not report success when curl fails before script execution.
+            // Verifies that editor installs do not report success when curl or checksum verification fails before script execution.
             NativeCliInstallCommand command = NativeCliCommandBuilder.BuildRemoteInstallCommand(
                 RuntimePlatform.OSXEditor,
                 TestBetaCliVersion,
@@ -76,7 +80,7 @@ public void GetInstallCommand_OnMacPropagatesInstallerDownloadFailure()
         [Test]
         public void GetInstallCommand_OnWindowsKeepsDispatcherPowerShellInstallerAvailable()
         {
-            // Verifies that editor installs use the dispatcher PowerShell installer script.
+            // Verifies that editor installs download the dispatcher PowerShell installer script and its checksum from the release, verify SHA-256, and run via -File, not `irm | iex`.
             NativeCliInstallCommand command = NativeCliCommandBuilder.BuildRemoteInstallCommand(
                 RuntimePlatform.WindowsEditor,
                 TestBetaCliVersion,
@@ -84,10 +88,17 @@ public void GetInstallCommand_OnWindowsKeepsDispatcherPowerShellInstallerAvailab
                 "/bin/zsh");
 
             Assert.That(command.FileName, Is.EqualTo("powershell"));
-            Assert.That(command.Arguments, Does.Contain($"https://raw.githubusercontent.com/hatayama/unity-cli-loop/{TestBetaReleaseTag}/scripts/install.ps1"));
-            Assert.That(command.Arguments, Does.Contain($"$env:ULOOP_VERSION='{TestBetaReleaseTag}'"));
+            Assert.That(command.Arguments, Does.Contain($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestBetaReleaseTag}/install.ps1"));
+            Assert.That(command.Arguments, Does.Contain($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestBetaReleaseTag}/install.ps1.sha256"));
+            Assert.That(command.Arguments, Does.Contain($"$env:ULOOP_VERSION = '{TestBetaReleaseTag}'"));
             Assert.That(command.Arguments, Does.Not.Contain("ULOOP_REMOVE_LEGACY"));
-            Assert.That(command.ManualCommand, Does.Contain("irm"));
+            Assert.That(command.ManualCommand, Does.Contain("$ErrorActionPreference = 'Stop'"));
+            Assert.That(command.ManualCommand, Does.Contain("Invoke-WebRequest"));
+            Assert.That(command.ManualCommand, Does.Contain("Get-FileHash"));
+            Assert.That(command.ManualCommand, Does.Contain("-File $script_path"));
+            Assert.That(command.ManualCommand, Does.Not.Contain("irm"));
+            Assert.That(command.ManualCommand, Does.Not.Contain("| iex"));
+            Assert.That(command.ManualCommand, Does.Not.Contain("raw.githubusercontent.com"));
             Assert.That(command.ManualCommand, Does.Not.Contain("npm"));
         }
 
@@ -132,7 +143,7 @@ public void GetInstallCommand_WhenVPrefixedVersionUsesDispatcherReleaseTag()
             Assert.That(command.Arguments, Does.Contain("dispatcher-v3.0.0"));
             Assert.That(
                 command.Arguments,
-                Does.Contain("https://raw.githubusercontent.com/hatayama/unity-cli-loop/dispatcher-v3.0.0/scripts/install.sh"));
+                Does.Contain("https://github.com/hatayama/unity-cli-loop/releases/download/dispatcher-v3.0.0/install.sh"));
         }
 
         [Test]
@@ -225,25 +236,37 @@ public void GetInstallCommand_WhenLocalPackageOnWindowsUsesPackageLocalInstaller
         }
 
         [Test]
-        public void BuildInstallerScriptUrl_WhenBetaVersionUsesReleaseInstallerScript()
+        public void BuildInstallerScriptUrl_WhenBetaVersionUsesReleaseInstallerAsset()
         {
-            // Verifies that beta editor installs use the script shipped with the selected dispatcher release.
+            // Verifies that beta editor installs point at the release-asset install.sh, matching `uloop update`'s verified download URL.
             string url = NativeCliCommandBuilder.BuildInstallerScriptUrl(
                 TestBetaReleaseTag,
                 CliConstants.POSIX_INSTALL_SCRIPT_NAME);
 
-            Assert.That(url, Is.EqualTo($"https://raw.githubusercontent.com/hatayama/unity-cli-loop/{TestBetaReleaseTag}/scripts/install.sh"));
+            Assert.That(url, Is.EqualTo($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestBetaReleaseTag}/install.sh"));
         }
 
         [Test]
-        public void BuildInstallerScriptUrl_WhenStableVersionUsesReleaseInstallerScript()
+        public void BuildInstallerScriptUrl_WhenStableVersionUsesReleaseInstallerAsset()
         {
-            // Verifies that stable editor installs use the script shipped with the selected dispatcher release.
+            // Verifies that stable editor installs point at the release-asset install.ps1, matching `uloop update`'s verified download URL.
             string url = NativeCliCommandBuilder.BuildInstallerScriptUrl(
                 TestStableReleaseTag,
                 CliConstants.WINDOWS_INSTALL_SCRIPT_NAME);
 
-            Assert.That(url, Is.EqualTo($"https://raw.githubusercontent.com/hatayama/unity-cli-loop/{TestStableReleaseTag}/scripts/install.ps1"));
+            Assert.That(url, Is.EqualTo($"https://github.com/hatayama/unity-cli-loop/releases/download/{TestStableReleaseTag}/install.ps1"));
+        }
+
+        [Test]
+        public void BuildInstallerChecksumUrl_AppendsShaSuffixToScriptUrl()
+        {
+            // Verifies the checksum URL points at the release-asset .sha256 sidecar next to the installer script.
+            string scriptUrl = NativeCliCommandBuilder.BuildInstallerScriptUrl(
+                TestBetaReleaseTag,
+                CliConstants.POSIX_INSTALL_SCRIPT_NAME);
+            string checksumUrl = NativeCliCommandBuilder.BuildInstallerChecksumUrl(scriptUrl);
+
+            Assert.That(checksumUrl, Is.EqualTo(scriptUrl + ".sha256"));
         }
 
         [Test]
diff --git a/Packages/src/Editor/Domain/CliConstants.cs b/Packages/src/Editor/Domain/CliConstants.cs
index a66485a8c6..a311eb3fcb 100644
--- a/Packages/src/Editor/Domain/CliConstants.cs
+++ b/Packages/src/Editor/Domain/CliConstants.cs
@@ -13,7 +13,7 @@ public static class CliConstants
         public const string VERSION_FLAG = "--version";
         public const string SHORT_VERSION_FLAG = "-v";
         public const string JSON_FLAG = "--json";
-        public const string RAW_CONTENT_BASE_URL = "https://raw.githubusercontent.com/hatayama/unity-cli-loop";
+        public const string RELEASE_DOWNLOAD_BASE_URL = "https://github.com/hatayama/unity-cli-loop/releases/download";
         public const string SCRIPTS_DIR_NAME = "scripts";
         public const string POSIX_INSTALL_SCRIPT_NAME = "install.sh";
         public const string WINDOWS_INSTALL_SCRIPT_NAME = "install.ps1";
diff --git a/Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs b/Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs
index 5698b28606..45924f6194 100644
--- a/Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs
+++ b/Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs
@@ -44,9 +44,11 @@ internal static NativeCliInstallCommand BuildInstallCommandWithPackagePath(
                 string localScriptPath = ResolvePackageLocalInstallerScriptPath(
                     packageResolvedPath,
                     CliConstants.WINDOWS_INSTALL_SCRIPT_NAME);
+                string windowsScriptUrl = BuildInstallerScriptUrl(releaseTag, CliConstants.WINDOWS_INSTALL_SCRIPT_NAME);
                 string command = string.IsNullOrEmpty(localScriptPath)
                     ? BuildWindowsRemoteInstallScriptCommand(
-                        BuildInstallerScriptUrl(releaseTag, CliConstants.WINDOWS_INSTALL_SCRIPT_NAME),
+                        windowsScriptUrl,
+                        BuildInstallerChecksumUrl(windowsScriptUrl),
                         releaseTag)
                     : BuildWindowsLocalInstallScriptCommand(localScriptPath, releaseTag);
                 return new NativeCliInstallCommand(
@@ -58,9 +60,11 @@ internal static NativeCliInstallCommand BuildInstallCommandWithPackagePath(
             string posixLocalScriptPath = ResolvePackageLocalInstallerScriptPath(
                 packageResolvedPath,
                 CliConstants.POSIX_INSTALL_SCRIPT_NAME);
+            string posixScriptUrl = BuildInstallerScriptUrl(releaseTag, CliConstants.POSIX_INSTALL_SCRIPT_NAME);
             string posixCommand = string.IsNullOrEmpty(posixLocalScriptPath)
                 ? BuildPosixRemoteInstallScriptCommand(
-                    BuildInstallerScriptUrl(releaseTag, CliConstants.POSIX_INSTALL_SCRIPT_NAME),
+                    posixScriptUrl,
+                    BuildInstallerChecksumUrl(posixScriptUrl),
                     releaseTag)
                 : BuildPosixLocalInstallScriptCommand(posixLocalScriptPath, releaseTag);
             string loginShellCommand = BuildLoginShellPosixInstallScriptCommand(posixCommand);
@@ -83,15 +87,25 @@ internal static NativeCliInstallCommand BuildUninstallCommand(
                 $"{QuoteProcessArgument(installPath)} uninstall");
         }
 
-        private static string BuildPosixRemoteInstallScriptCommand(string scriptUrl, string releaseTag)
+        private static string BuildPosixRemoteInstallScriptCommand(string scriptUrl, string checksumUrl, string releaseTag)
         {
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(scriptUrl), "scriptUrl must not be null or empty");
+            UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(checksumUrl), "checksumUrl must not be null or empty");
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(releaseTag), "releaseTag must not be null or empty");
 
-            return "tmp_script=$(mktemp) && "
-                + "trap 'rm -f \"$tmp_script\"' EXIT && "
-                + $"curl -fsSL {QuotePosixShellValue(scriptUrl)} -o \"$tmp_script\" && "
-                + $"{CliConstants.INSTALL_VERSION_ENVIRONMENT_VARIABLE}={QuotePosixShellValue(releaseTag)} sh \"$tmp_script\"";
+            // Why: The whole command runs as a single /bin/sh -c string where `set -e` is not applied
+            // for us, so every step is && chained to fail fast when curl, checksum verification, or
+            // execution fails. `trap ... EXIT` ensures the temp directory is removed even on failure.
+            string scriptName = CliConstants.POSIX_INSTALL_SCRIPT_NAME;
+            return "tmp_dir=$(mktemp -d) && "
+                + "trap 'rm -rf \"$tmp_dir\"' EXIT && "
+                + $"curl -fsSL {QuotePosixShellValue(scriptUrl)} -o \"$tmp_dir/{scriptName}\" && "
+                + $"curl -fsSL {QuotePosixShellValue(checksumUrl)} -o \"$tmp_dir/{scriptName}.sha256\" && "
+                + "( cd \"$tmp_dir\" && "
+                + $"if command -v sha256sum >/dev/null 2>&1; then sha256sum -c {scriptName}.sha256; "
+                + $"elif command -v shasum >/dev/null 2>&1; then shasum -a 256 -c {scriptName}.sha256; "
+                + $"else echo 'sha256sum or shasum is required to verify {scriptName}' >&2; exit 1; fi ) && "
+                + $"{CliConstants.INSTALL_VERSION_ENVIRONMENT_VARIABLE}={QuotePosixShellValue(releaseTag)} sh \"$tmp_dir/{scriptName}\"";
         }
 
         private static string BuildPosixLocalInstallScriptCommand(string scriptPath, string releaseTag)
@@ -108,13 +122,37 @@ internal static string BuildLoginShellPosixInstallScriptCommand(string posixComm
             return $"{CliConstants.POSIX_SHELL_EXECUTABLE_PATH} -c {QuotePosixShellValue(posixCommand)}";
         }
 
-        private static string BuildWindowsRemoteInstallScriptCommand(string scriptUrl, string releaseTag)
+        private static string BuildWindowsRemoteInstallScriptCommand(string scriptUrl, string checksumUrl, string releaseTag)
         {
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(scriptUrl), "scriptUrl must not be null or empty");
+            UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(checksumUrl), "checksumUrl must not be null or empty");
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(releaseTag), "releaseTag must not be null or empty");
 
-            return $"$env:{CliConstants.INSTALL_VERSION_ENVIRONMENT_VARIABLE}={QuotePowerShellSingleQuotedValue(releaseTag)}; "
-                + $"irm {QuotePowerShellSingleQuotedValue(scriptUrl)} | iex";
+            // Why: Downloading with Invoke-WebRequest to a file and re-launching PowerShell with -File
+            // replaces the previous `irm | iex` streaming path so the script is verified before it runs
+            // and so the child process owns exit-code propagation. `$ErrorActionPreference = 'Stop'`
+            // upgrades cmdlet non-terminating errors (e.g. missing checksum file) into throws so the
+            // fail-close path does not depend on incidental null dereferences downstream. The .sha256
+            // file contains "<hex-hash>  <filename>", so the leading whitespace-delimited token is
+            // compared as lower case against Get-FileHash's upper-case output.
+            string scriptName = CliConstants.WINDOWS_INSTALL_SCRIPT_NAME;
+            return "$tmp_dir = New-Item -ItemType Directory -Path (Join-Path $env:TEMP ([System.Guid]::NewGuid().ToString())) -Force; "
+                + $"$script_path = Join-Path $tmp_dir.FullName {QuotePowerShellSingleQuotedValue(scriptName)}; "
+                + $"$checksum_path = Join-Path $tmp_dir.FullName {QuotePowerShellSingleQuotedValue(scriptName + ".sha256")}; "
+                + "try { "
+                + "$ErrorActionPreference = 'Stop'; "
+                + "$ProgressPreference = 'SilentlyContinue'; "
+                + $"Invoke-WebRequest -UseBasicParsing -Uri {QuotePowerShellSingleQuotedValue(scriptUrl)} -OutFile $script_path; "
+                + $"Invoke-WebRequest -UseBasicParsing -Uri {QuotePowerShellSingleQuotedValue(checksumUrl)} -OutFile $checksum_path; "
+                + "$expected_hash = ((Get-Content -Raw -Encoding UTF8 $checksum_path) -split '\\s+')[0].ToLowerInvariant(); "
+                + "$actual_hash = (Get-FileHash -Algorithm SHA256 -Path $script_path).Hash.ToLowerInvariant(); "
+                + $"if ($actual_hash -ne $expected_hash) {{ throw ('Checksum mismatch for {scriptName}: expected=' + $expected_hash + ' actual=' + $actual_hash) }}; "
+                + $"$env:{CliConstants.INSTALL_VERSION_ENVIRONMENT_VARIABLE} = {QuotePowerShellSingleQuotedValue(releaseTag)}; "
+                + "& powershell -NoProfile -ExecutionPolicy Bypass -File $script_path; "
+                + $"if ($LASTEXITCODE -ne 0) {{ throw ('{scriptName} exited with code ' + $LASTEXITCODE) }} "
+                + "} finally { "
+                + "Remove-Item -Recurse -Force -LiteralPath $tmp_dir.FullName -ErrorAction SilentlyContinue "
+                + "}";
         }
 
         private static string BuildWindowsLocalInstallScriptCommand(string scriptPath, string releaseTag)
@@ -196,7 +234,17 @@ internal static string BuildInstallerScriptUrl(string releaseTag, string assetNa
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(releaseTag), "releaseTag must not be null or empty");
             UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(assetName), "assetName must not be null or empty");
 
-            return $"{CliConstants.RAW_CONTENT_BASE_URL}/{releaseTag}/{CliConstants.SCRIPTS_DIR_NAME}/{assetName}";
+            // Why: Installer scripts are shipped as dispatcher release assets alongside their .sha256
+            // sidecars, so the release download URL is used instead of raw content refs to keep the
+            // Unity install path in sync with `uloop update`'s verified installer download.
+            return $"{CliConstants.RELEASE_DOWNLOAD_BASE_URL}/{releaseTag}/{assetName}";
+        }
+
+        internal static string BuildInstallerChecksumUrl(string scriptUrl)
+        {
+            UnityEngine.Debug.Assert(!string.IsNullOrWhiteSpace(scriptUrl), "scriptUrl must not be null or empty");
+
+            return scriptUrl + ".sha256";
         }
     }
 }