I want to go back to Parallels 12 after trying out Parallels 13

Want to go back to Parallels 12 after trying out Parallels 13. I really don't see any advantage other than making Parallels more money. There is no way that I can see on how to get back. It appears that the so called trial all it does is lock your existing account.
If anyone knows hoe to get back to the previous, please let me know.

 

http://www.parallels.com/directdownload/pd12/

 

Thank you

 

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