MAMEdev have specifically targetted MESSUI and MAMEUI in an effort to stamp them out unless they conform to new legality requirements. This applies to all other derivative builds as well, such as MAME Plus!, MAME4ALL, MAMEUIFX, Coinops, etc.
MAME Plus! already died, so anything based on that is already ended.
A sad day. Maybe it's time to try out FBA.
EDIT: not quite as bad as first thought. Some of us got together and the legal issues for MAMEUI, HBMAMEUI and MESSUI have been solved. However due to different reasons there may not be a release for a while. MAMEUIFX is well on the way to legality, and there should be a 0.172 release.