Instead, look for from reputable trackers, or better yet, use a ROM manager like ClrMAMEPro to rebuild your own set from a DAT file.
You download a 50GB file, unzip it, and are greeted by thousands of files named things like sf2.zip , pacman.zip , or neogeo.zip . Suddenly, MAME says 90% of your "working" games are missing files. mame rom pack zip
MAME is the best piece of preservation software ever written. Respect the zip format, learn the parent/clone system, and you will have every arcade game from 1975 to 2000 running perfectly. Instead, look for from reputable trackers, or better