You can install it by first enabling Steam Play for other games in your Steam settings (only temp, you can change it back later) and then after that's done, put "steam://install/92" (remove the quotes) in your browser's URL bar and hit enter and it will prompt you to open the link in Steam to install it, that is the easy part done, to get it to run you..... takes large breath need to try to start it after it's done installing and you will (maybe) see a window pop up then go away, then you should just hear the game music with no window (believe it or not this is good), now while keeping the game open (the music should still be playing and Steam saying it's running) open your task manager of choice (I'm using gnome's) and find the process that the game is trying to run out of, it can very with what the name of that process may be, I found mine using the "View open files" function of my task manager and looked for an open file called "codenamegordon.exe", once you have the location of that exe file, find it, copy it to a safe place (e.g. your home folder) and then stop the game though Steam (the music should stop), now right click on Codename Gordon in Steam and open the "Properties..." menu and click on "Local Files", now hit browse and you should see your file manager pop up with a folder that should have a file called "cg.exe", Rename it, delete it or what ever you want to do with it as long as it's not named "cg.exe" (I just moved mine to the trash) and now keep this folder open and open a new window/tab to the place you put the file you copied before ("codenamegordon.exe") and move it in to the folder you just deleted/renamed "cg.exe" in, now rename "codenamegordon.exe" to be named "cg.exe" (this is so Steam will launch the right thing), Now, after all that, you can go back to Steam and launch Codename Gordon, now you should get a window that has a cute little pixel Gordon running to the words loading!