Important: This website is now read only (except to admins) to comply with the UK Online Safety Act. Composr CMS is in the process of migrating to a new Constitutional governance model and Bazaar development model, with functionality of the old website (constructed by ocProducts Ltd, the prior copyright holder, a UK company) spread between GitLab and the new website (which has no connections to the UK).
This is an APS package of Composr. APS is a standardised package format potentially supported by multiple vendors, including Plesk. We will update this routinely when we release new versions, and update the APS catalog.
It can be manually installed into Plesk using the Application Vault interface available to administrators.