Since a direct PPSSPP download isn't possible, here are the legitimate ways to play the game on your mobile device: I Tested The Last Of Us In Two PS3 Emulators!
Leo sighed, watching his phone reboot into a permanent loop. He had wanted a story of survival in a post-apocalyptic world. Instead, he got a front-row seat to the apocalypse of his own mobile data.
Be extremely cautious of YouTube videos or websites promising a "Highly Compressed TLOU ISO" for PPSSPP.