Hello, I am running MacOS 10.14.6 and I have an application that I run on Windows 7 under Parallels 14 and it works great. When I purchased Parallels 15 and upgraded, the application looks very poor. I would like to keep running this Windows 7 VM under Parallels 14 but I have some Linux VMs I can only run under Parallels 15. How can I install both Parallels 14 and 15 on the same Mac? Thanks!