Gameloft discontinued support for the game in 2017. It is no longer available on official stores like Google Play or the Apple App Store, though the APK can still be found on third-party sites like How to Play on PC
Since there is no native Windows version, the only way to play the Iron Man 3 game on a computer is through an Android emulator Download an Emulator: Install software such as BlueStacks Obtain the APK: Download the Iron Man 3 APK (the file format for Android apps) from a source like Install in Emulator: Iron Man 3 Pc Game Free Download Full Version Softonic 20
There is no official full version of the Iron Man 3 released by Gameloft discontinued support for the game in 2017