Upgrade Parallels 8 to 11 possible?

Dear Juergen,
According to our licensing policy, an upgrade to Parallels Desktop 11 for Mac is supported from the following versions only:
Parallels Desktop 9 for Mac
Parallels Desktop 9 for Mac Upgrade
Parallels Desktop 10 for Mac
Parallels Desktop 10 for Mac Upgrade
If your previous version key is for Parallels Desktop 8 or earlier, please visit the Parallels Online Store to purchase a full license for Parallels Desktop 11 for Mac:
http://www.parallels.com/store/
Please refer to this article to activate Parallels Desktop 11 for Mac.
 
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