For finding the best, cleanest versions of this set, users generally prefer sources that offer a "verified" or "curated" collection to avoid corrupt files or non-working clones. MAME for Android 0.139 - All Working Games - Databases
If you have a (which is not distributed legally), you can:
Search for "MAME 0.139u1 Reference Set." This is the gold standard for verified, virus-free preservation sets.
to grant the necessary "All Files Access" if the emulator cannot see your storage. to verify your existing ROM files?