How do you install a downloaded game on PC

Depending on the file format. If you downloaded the file from a torrent website it will most likely be a .ISO file. You can then burn it to a disk and then install it, if you cant do that, then youll need to use a program that can read those files, such as Magic ISO or Magic Disk. With Magic Disk for example, it will create a virtual CD drive. Youll have to attatch the ISO file to the virtual drive. Then it can run as if it were a real CD. It will then install and you can play the game, you just have to keep the file combined to the virtual disk in in order to play the game.