Liked the App while it worked, very much. It was a 3.5 IIRC.
Then after a long time not using it, I started the App, and an update nag screen appeared, and unluckily I did try to update, failed miserably, though. A mere ≈500k was all left of the old, formerly working App.
So I tried to at least install the latest copy from here @MacUpdate—BTW, MU Desktop 6 App does not even run on Snow Leopard! Amongst other probs...—which only finished after I trashed the running copy, due to a running Spotlight importer...
Trouble is, the drag'n'drop “installed” App does not start at all!
And I even tried to run it on my old trusty 2010 Mac mini, also Snow Leopard, no success, too.
Besides, the ZIP archive tries to expand the App DIRECTLY into the /Applications folder—of course, Mac OS/Finder does not tolerate that.
So without an alternative Unpacker it could not even unextract the App!
I had ALZip at hand, yes, from the Mac AppStore, with the standard setting to unpack right in the archive's folder, so that worked like a charm. But with the standard system's archive utility, it does not work at all.
Got to tell the developer all that! And I will...
In the mean time, I'll try to find an older version that works.