So, if you want to play Fallout New Vegas on your PS5 and PS4, you will
need a PS Plus Premium subscription. This is the only way to access the
game on PS5 and PS4. Sony reserves PS Plus Premium for all of those
PlayStation Classics from the PS1, PS2, PS3, and PSP era.
How to play Fallout New Vegas on PS5 and PS4 — here's your only option