Parallels is a company that prides itself on innovation; as such, some older versions of its control panel are no longer supported. Please see below the minimum version that is currently available for purchase via the LicenseCube website:
Parallels Minimum Version: 9.5
If you should have an older version of Parallels Plesk than the one listed above, we strongly recommend you upgrade to at least the minimum version outlined above.
Should you have any further questions pertaining to your Plesk license, please feel free to get in contact with the LicenseCube support team for additional assistance.
Article Number: 236
Posted: Tue, May 22, 2012
Last Updated: Tue, May 22, 2012
Posted: LicenseCube Support [support@licensecube.com]
Online URL: http://kbase.licensecube.com/sales-faqs/what-versions-of-parallels-plesk-license-are-available.html