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Have you seen this post? https://forum.parallels.com/threads/what-i-learned-in-installing-win-10-under-parallels.329225/ I couldn't get anywhere...
I had very similar problems, albeit with not quite as much physical RAM as you have. It all worked fine after I'd read a thread on here that...
This worked like a dream. Thank you! It's a shame that the Parallels documentation hasn't been updated to include such useful additional...