I downloaded the entire SNES catalogue when I was overseas; so glad I did that then as it’s become much more difficult over the past few years.
II recently tried to download ISOs of my PS1 & 2 collections so that I could play them on my Steam Deck, and found out that at it’s actually a lot faster and easier just to to them myself - as whatever sources I can find are either dead links, or download so slowly that the connection is likely to time out before the download completes.