Download-doom-v3-228-unk-64bit-os130-ok13-user-hidden-bfi-ipa

Use a trusted source port like Mac Source Ports to run the engine.

This is the most popular source port for the original Doom 3. You can follow the dhewm3 Tutorial on YouTube to set it up on macOS Big Sur or later. Use a trusted source port like Mac Source

The "ipa" extension suggests you are looking to side-load the game onto an iPhone or iPad. Historically, projects like (available on GitHub ) allow users to compile the engine for mobile, though you must provide your own legal game data files (assets). Safety Note Use a trusted source port like Mac Source