Hi. I use Parallels 17.1.1 Standard Edition on Big Sur to run High Sierra and Windows 10. (1) Now I need to run Mojave as a guest OS. Is it safe to run a third guest OS? (2) I also consider the possibility of upgrading High Sierra to Mojave within Parallels. When my husband installed Parallels for me last year, he could not install Mojave (Mojave refused to install), and therefore he had to install High Sierra instead. Now, I have a need to run Mojave. Is it safe (does it work) to upgrade High Sierra to Mojave within Parallels? Thank you. Miki
