Hello. MacOS (Sierra) recently crashed. I previously was running Parallels 11. After reinstalling Sierra, Parallels 11 wouldn't install. I installed Parallels 15. I am trying to run BootCamp from an external USB. It is the same installation, same disk i used with Parallels 11. Parallels 15 doesn't seem to recognize a BootCamp disk. I can boot the disk from startup. What can I do? Thank you for any help