A little over a month ago, Apple started letting customers download older versions of App Store apps. This handy new capability was designed to allow folks on legacy hardware to download the last compatible app version for their outdated iOS build. Up until then, the most recent app version available had used to render all of the previously submitted app builds inaccessible in the Mac App Store.
The same 'Previous Versions' feature is now coming to the Mac App Store, writes Apple in its memo to the registered Mac developer community, adding devs can now "let users download an older version” of their apps. I've got more information right below...