Always "Run as Administrator" to ensure the game has permission to save your mission progress [26].
If you are trying to run any IGI-related setup on a modern Windows version (10 or 11), follow these steps to avoid crashes: igi-3-setup-for-pc
Depending on what you are looking for, here are the most common ways to experience a modern version of IGI on your PC: Always "Run as Administrator" to ensure the game