. If you are being prompted for one, it is likely because the game was downloaded as a compressed archive (such as a .zip or .rar file) from a third-party website. Common Causes for Password Prompts Third-Party Archives

Assuming you have the game files (ISO or extracted folder), follow these steps:

For almost all legitimate releases of IGI 1 (including the original CD-ROM and many digital backups), the universally accepted installation password is:

Many abandonware sites host broken versions of IGI 1 where the password algorithm itself is corrupted.

: Because the game is over 20 years old, right-click the setup.exe or IGI.exe file, go to Properties > Compatibility , and select Windows XP (Service Pack 3) .