If you search for a Red Dead Redemption 1 PSP ISO or CSO file, you will likely find dozens of YouTube videos and websites claiming to host the game. You should approach these with extreme caution for several reasons:
Excellent, but requires a powerful PC or console and a good router. red dead redemption 1 psp download
If you want a Western game on your actual PSP hardware (not streaming), here are the best homebrew options that scratch the same itch. You can find these as legal homebrew downloads: If you search for a Red Dead Redemption