SecondCor521
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Tech Specs on HRB site says a mac requires MacOS 10.15 or higher. I'm still on 10.13 and can't go higher. Wonder if that is really a deal breaker.
Theoretically, many programs would probably be able to run on an older OS version just fine.
Practically speaking, software developers and testers don't want to support older versions (it's a hassle). So when the program loads and initializes, it'll often just do an OS version check and should gracefully quit.
If you were able to run the software in a debugger and short circuit the version test, you'd know for sure.