The software I use and need runs fine in Windows 7 but Catalina requires 64 bit applications. However, if I'm running Parallels 15 (64 bit) can Windows 7 run inside Parallels 15?
Hi GaryC9. Windows 7 can be used with Parallels Desktop 15 for Mac on macOS Catalina. Please refer this article to know the list of supported guest OS in Parallels Desktop 15 for Mac.