10.15

When I upgraded from a (much) older version of Parallels to 15, I had several virtual machines, including one older version of macOS (10.10 I believe) for testing. I used it repeatedly since then, but it often failed to boot, pretty much at random. I type my password, it would start with the...

Hi, I virtualized a MacOS10.15 on parallels desktop15 MacOS10.13. I set the vram to 2GB, but MacOS10.15 can only detect 256MB vram, now how can I let it use more vram? P.S. I am using a NVIDA 1080 graphics card(with 8GB vram), how can I use 4GB or even 6GB vram for parallels? (must I upgrade to...