In short: Downloading full commercial ROM sets from Archive.org is generally copyright infringement unless you meet specific legal exceptions.
Use No-Intro DAT files (available from datomatic.no-intro.org) with a ROM manager to: All Nes Roms Archive.org
A complete licensed NES set (US + EU + JP) is ~1,350 unique games. In short: Downloading full commercial ROM sets from Archive
On Archive.org, you’ll find collections claiming to have the complete US + Japan + Europe NES library (licensed + unlicensed). Popular uploads include: A complete licensed NES set (US + EU
⚠️ No official “All ROMs” set exists – these are user-uploaded, often incomplete or with bad dumps.