I received a notice today to upgrade for free to parallels 16. What a mistake to be the first. Here are all the issues so I far I have encountered and am stuck without an operating system now! I am on Mac OS 10.15.6 catalina. Parallels needs an update set of instructions!! 1) Install - wont install because of security. I right click and try to open. Still wont install. Tried a few things, didnt work. Hmm, I go into Security and Privacy settings and general, and and see it is blocked, so I allow apps downloaded from parallels. Install works. 2) Now I start up parallels 16. "The boot camp partition used by hard disk 1 is missing". Great. What to do now? Go to settings, hardware, hard disk and the source is pointed to the partitioned drive with my boot camp partition. WTF??? I read a few forum descriptions how to fix and it is ugly. At this point, I want to restore the settings for Parallels 15 and run parallels 15 and let other people figure out how to get 16 to work. How do I restore the parallels 15 settings? I have time machine, Many thanks for helpers!