We have a plan with Plesk 8 and license class for Plesk 8 is configured in hosting plan. We have the subscription with Plesk 8 and also license. How to update Plesk to the latest version?
Upgrade of Plesk 8.x to version 10.x or 11.x is not officially supported. Plesk 8.x may be upgraded to version 9.5 only. But this versions is outdated also:
Distributive of Plesk 9.x is disabled in official repositories. Please contact your Account Manager for assistance with upgrading Plesk 8.x.