The emulator is designed specifically to run PSP games (ISO/CSO files). Since Uncharted 1 is not a PSP game, there is no such thing as an official “Uncharted 1 PPSSPP download.” Any website claiming to offer a direct download of Uncharted 1 as a PSP file is either:
: This is the only dedicated handheld entry in the series, but it was released for the , not the PSP. Uncharted 1 Ppsspp Game Download