In the MAME community, "ROM churn" is a real pain. A game that worked in 0.139 might be "non-working" in 0.150 because the emulator now expects a perfect, bit-for-bit dump of a different revision of the PCB. The is considered a "frozen" standard. If you build an arcade cabinet in 2021 using this pack, you never have to update your ROMs again.
If you download a pack labeled "Mame 0.139u1 Roms Pack - Repack 2021" and the file size is exactly 28.4 GB (7-Zip compressed), you have found the "Holy Grail" of emulation: every classic arcade game from 1975 to 2005, stable, fast, and ready to play. Mame 0.139u1 Roms Pack Download -2021-
Place your .zip files in the /ROMs/MAME4all or /MAME2010 folder of your emulator. In the MAME community, "ROM churn" is a real pain
Because ROM distribution is legally contested, you cannot find these on the official MAME site (mamedev.org). However, in 2021, several archival and "abandonware" communities continued to host these packs under the guise of "educational preservation." If you build an arcade cabinet in 2021
If you cannot find a stable download, or you want a more modern experience, consider these: