Make Musescore2 and later unexecutable on Mac OS X 10.6 or earlier
As MuseScore2 does not run on Mac Snow Leopard (OSX 10.6) or earlier [PITY!], it would be useful to ensure it doesn't even try to run. You just need to add the following to the bundle Info.plist file:
A minor issue, certainly, but I dual boot between El Capitan and Snow Leopard and, occasionally, need to run the Old MuseScore on Snow Leopard. Until I made this change to the MuseScore2.app bundle, nothing I could do would stop it loading on Snow Leopard in preference to version 1.3.