These are 50-200MB downloads labeled as "IGI 4 Mobile." When installed, they are usually:
The original developer, Innerloop Studios, closed its doors in 2002. The rights to the IGI franchise passed through several hands. In 2021, developer Toadman Interactive and publisher Antimatter Games announced I.G.I. Origins (a prequel), but that project was later canceled.
First, the hard truth:
Sites offering pirated or non-existent Android APK files frequently bundle them with malware, adware, or spyware that can steal your personal data or compromise your smartphone. PC to Android Incompatibility: