If you want to play the real game on your mobile device, you must use or remote play services:
No, the hardware requirements are too high. Days Gone Download For Android PPSSPP - isoroms.com PPSSPP
Once you have a legal .ISO or .CSO file, adding it to PPSSPP is simple. If you want to play the real game
To understand why this download is impossible, it helps to look at the hardware and software generation gap between the game and the emulator. Days Gone Download For Android PPSSPP - isoroms.com PPSSPP