Steam – How to install the Steam version of DC Universe Online using the DCUO install CD’s

I had the same problem, and I really have no idea why it happens or how to fix it. I have, however, found a workaround. I tend to just do this from the get-go instead of actually using the setup, because of weird issues like this.

1. Don't run the disc setup; instead, activate your CD key manually, and abort the actual installation process.
2. Open the backup window (Steam → Backup and Restore Games…).
3. Select Restore a previous backup.
4. Browse to the drive letter of the installation disc.
5. Steam should tell you that it found a backup of Modern Warfare 3. Click next.
6. The game will install from disc.

This has worked for me with MW3 specifically, and other games.

Note that you can't entirely avoid downloading it; you'll still have to download the latest patches to bring your game up to date.

On the bottom left of steam there is a button that says 'Add a game' simply click that, select 'none Steam game' and find the 'SKSE.exe' which should be in your root Skyrim directory. Name it whatever you'd like, doesn't matter. When you launch it via Steam it will start Skyrim using SKSE. However all the steam stats will be added to the official Skyrim game in Steam. So everything works as it should!