Take the 5 GWX .cfg files and place them into the cfg folder found in the SH3 Commander folder. When you place them in the folder, a message will come up saying these files already exist and asking if you wish to overwrite them. Say yes and the GWX .cfg files will be installed. This only applies if you are using GWX 3.0.
Start SH3 Commander and click on the wrench to get to the options screens, then do what Jimbuna said, and you will not have to worry about doing a rollback, it will be done automatically for you.
