Parallels 12.0.1 seems to hang my Mac 10.11.6

I keep trying to update my Windows 10 fast track installation with no success. It reboots several times, leaving windows 10 icons in my Mac tray, and then fails. And Parallels becomes unresponsive, and one by one I have to force quit everything and eventually have to reboot my Mac. I never had this with Parallels 11. Can I revert?
 
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