ForeverAlone221

You can copy contents of the disk onto a hdd/sdd and then If you have another steam game on a disk insert it and look at the content and copy a folder called resources into the folder with the game you want to install but cant then click on setup.exe and it might come up with some weird launcher screen but click install and it should install the game you want, i had to do that to get two different games to work and it did the job