Pardon my ignorance, but I've never really understood the complexities of updating ROMS sets.
I've got a full .79 set, with updates stepping .79-.80, .80-.81, etc... Can't you just dump the .80 roms in the rom directory, then the .81 and so on? Doesn't this copy over old roms and add any new ones? Am I missing something?
Then wouldn't you use ClrMAME to just doublecheck?
I guess I'm confused by the word 'installing', it's making it sound very complex.