Compatibility with older OSs

Where is there a list of System Requirements for older versions of MuseScore?
On the download page there are links to the list of older version downloads still available.
The versions for Windows run from 3.0.0 to 3.6.2
The versions for MacOS run from 3.0.0 to 3.6.2
The versions for "Other packages for all platforms" runs from 1.1 to 3.2.3
But nowhere can I find a list of System Requirements for each of these older versions.
I note that jschmidling's enquiry ("Install Probs") two days ago pertains to the same problem and I daresay there are quite a few others who also would appreciate a straightforward list of System Requirements for using MuseScore on their older hardware.
BTW when I went to log in (so that I could lodge this enquiry) I found that the MuseScore website login facility is now incompatible with MacOS 10.7.5 Lion. So I had to go to another computer just to log in! Ho hum.