You cannot download or play Red Dead Redemption 2 using the PPSSPP emulator because the game was never released for the Sony PlayStation Portable (PSP).
You're looking for information on downloading Red Dead Redemption 2 on PPSSPP, a popular PlayStation Portable emulator. Here's what I have to share: Red Dead Redemption 2 Ppsspp Zip File Download
Fake/Malicious Files: High-risk downloads that may contain malware or surveys instead of an actual game. Real Ways to Play You cannot download or play Red Dead Redemption
is an advanced, eighth-generation game designed for powerful hardware like PlayStation 4 . PPSSPP is an emulator specifically for PlayStation Portable (PSP) Real Ways to Play is an advanced, eighth-generation
Emulator Scope: The PPSSPP Emulator is designed specifically to play Sony PSP games. Since Rockstar Games never released RDR2 for the PSP, there is no legitimate ISO or ROM file for the emulator to run.