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Installation
Grigoriy Ermolaev edited this page Sep 17, 2026
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Calendar requires MantisBT 2.26.0 or newer. For MantisBT 2.14 – 2.25.x use the 2.6.x line (fixes only).
Download Calendar-vX.Y.Z.zip from the latest release — the archive contains the third-party dependencies. A plain git checkout is not installable: run composer install --no-dev --optimize-autoloader in it first, otherwise MantisBT marks the plugin as invalid (api/vendor/autoload.php is missing).
- Copy Calendar folder into plugins folder.
- Open Mantis with browser.
- Log in as administrator.
- Go to Manage -> Manage Plugins.
- Find Calendar in the list.
- Click Install.
Replace the Calendar folder in plugins/ with the new one, then open Manage -> Manage Plugins and click Upgrade next to Calendar. Release notes of every version list the steps a particular upgrade needs; a release that migrates data asks for confirmation before touching the database.