Parallels has been offering a tech guarantee for a free upgrade in years past. Is this gone for 2016? I found last year's link on the website:
http://www.parallels.com/techguarantee2015/
Years past have published the guarantee starting late July, just prior to the release of latest version of MacOS (X).
http://www.parallels.com/techguarantee2015/
Years past have published the guarantee starting late July, just prior to the release of latest version of MacOS (X).