The game being shared in an ISO format suggests it's being distributed as a single file that can be mounted or extracted to install the game. ISO files are often used for game distribution, especially for PC games, as they can contain the complete game installation.
Users often report issues with save files not loading or the game failing to launch. A common community fix involves using a Goldberg Emulator and modifying the steam_api64.ini file to change LocalSave = 0 to LocalSave = 1 . The game being shared in an ISO format