Current version of Roundcube webmail is not latest, how to update it on Plesk Automation (PA)?
There is no such option in current PA release. Current supported version is 0.9.5. Internal requests in order to update Roundcube have been registered with id #PPA-2716 and #PPA-3310.
The fix is considered to be included in one of the next PA updates.
Please use provided ID to track maintenance in Plesk Automation release notes.
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NOTE: manual Roundcube upgrade could be done without any guaranties that it will be integrated with mail services properly, since this option was not tested. Even if upgrade is finished successfully, such configuration will not be officially supported.