IDC/Games UFO Online: Invasion Download DOWNLOAD AND SETUP IN 4 SIMPLE STEPS 1 Download should have started. If not, please, click here . 2 Once the download is over, click on the "ufosetup_idc.exe" file to run the installer. 3 Follow the instructions to complete the installation and click “Next”. 4 "ufosetup_idc.exe" will start after you finish the installation. If you are already registered in IDC/Games, log in with your username and password and start the game!.