Originally Posted by Supamax
Why in hell am I forced to download again the rom sets any time?
A few reasons I can think of:
... Maybe some of the roms were bad dumps and then replaced later when a good dump has been achieved / verified. Dumping roms can be very difficult, just check out some of the information / images posted by The Guru
and you'll get a better idea of the complexity.
... The names of roms have been renamed to match schematics.
There are probably a few other possible reasons that sadly elude me at present.