There is no official release of Tekken 8 for the PPSSPP emulator or any mobile platform. Tekken 8 is a next-generation fighting game developed exclusively for PlayStation 5, Xbox Series X|S, and PC (Steam).
Introduction to Tekken 8 and PPSSPP
Note: Tekken 8 is not currently available on the PPSSPP platform, as it was released for PlayStation 5, Xbox Series X/S, and PC (via Steam) in January 2023. However, I'll provide information on how to download and play Tekken 7 on PPSSPP, which is a popular alternative. tekken 8 ppsspp download highly compressed
PSP ISO Compressor (Windows utility)UMDGen