That's it. I tried everything: Ran as administrator, re-downloaded them, turned off antivirus, safe mode, checked if Windows had suspended the threads etc. Nothing. Both x64 and x86 versions. When I click them, the icon even changes to working mode but nothing happens. Weird, to say the least.
Given that situation, I'd like to know if someone could upload somewhere MAME x64 in a already extracted and zipped folder, because I would like to update my fullset and try some new working Toaplan games.