IGI 1 cannot write to the registry or save folder if you do not have permissions.
: You can find "Project IGI 1 all mission unlocked save files" on community sites like SaveToGames PC Savegames Installation Extract the downloaded Copy the content (often a folder named or specific Navigate to your IGI installation directory (e.g., C:\Program Files\Project IGI\ igi 1 all mission unlock key fixed
If the keys do not work on your version, you can manually unlock missions by replacing your save files: IGI 1 cannot write to the registry or