Yeah the problem with mame, and the reason that I've become frustrated with it as the years go on is that roms are constantly re-dumped and renamed making it impossible to do a simple update if you don't get every single update pack and apply them as new versions come out. The constant renaming I take issue with, it's unnecessary imho, but the re-dumping is important for game preservation and the continued development of game drivers so it's a necessary evil I guess. Of course these days, with all the garbage mixed in with the arcade games it's a maze just to figure out what games are available anyway. Unless you have a reason to update, it's better to leave a working setup alone imho.