Did you look here... http://messui.1emulation.com/ ??? Robbbert was kind enough to post both 64-bit and 32-bit version of MAMEUI. Thank you Robbbert!!!!
BTW, I welcome using the MESSUI UI for MAMEUI. If someone doesn't want to use the software list, that panel can be toggled off and it then looks like regular MAMEUI. Then just one source to maintain too.