On January 8, 2022 at 18:31, Mr. Big said...
I was running 32-bit Windows 7 on Parallels on my 2019 MacBook, but when I upgraded to the new M1 MacBook Pro it wouldn't support it anymore. I'm hoping for someone to come up with a workaround but that seems pretty unlikely.
Parallels 17 only supports Windows 10 & 11
As you say, Windows 7 is not supported
Providing Parallels supports Windows 10
32 bit, that would be your best (and probably only) option
Windows 11 doesn't have a 32 bit version, so that will not work with the MSC400.