Gran Turismo games are now very stable on RPCS3, the PS3 emulator
Sony actively monitors and sends DMCA takedowns to sites hosting GT5 ROMs. They have also sued emulation-related projects in the past (though RPCS3 remains untouched due to clean-room reverse engineering).
If you want a legitimate, hassle-free, and updated Gran Turismo experience on your computer, consider these:
: While the original game was locked at 1080p, RPCS3 allows for resolution scaling to 4K.
The only functional way to play the game on a PC is through using software like RPCS3 . Key Facts About Gran Turismo 5
: You must dump your own PS3 game disc into a digital format (ISO or folder) to load into the emulator.