Thanks for the information, really is a shame to see dev leave this project behind. Will have to take a look at the source code if it is available and look to getting it working with ethminer or getting someone to take over it and fork it and make a new multiminer out of it.
AFAICT, it looks like there has been a release and activity from the developer recently. Version 4.1.1 is out and there is github activity:
https://github.com/nwoolls/MultiMiner/commits/master