Any download labeled as "IGI 5 Extra Quality" or "Setup Free" is likely a modded version
Unofficial "setup" files from third-party sites often bundle adware, spyware, or viruses Compatibility Issues: Igi 5 Game Setup Free Extra Quality Download
The official Project I.G.I. series consists of only two released titles, with a third (prequel) currently in limbo. Any download labeled as "IGI 5 Extra Quality"