Download Mojave to install into Parallels as virtual machine
I am running Mojave OS and have installed Parallels. I want Mojave as a vm w/in parallels. so I can update laptop to Catalina. The Parallell instructions don't work. How can I download Mojave from Apple? I have gone to the App store, as suggested, but it says that version is damaged and cannot be installed. Also, all I want to do is download it so I can install in virtual machine. I don't want to (obviously) install it over my current system.
Any help would be appreciated.
MacBook Pro (2020 and later)