First things first we want to make up the normal game. Goto C:\Program Files\Sierra\Empire Earth II. There you should see a folder called zips. Right click on this and push copy. Minimize to you desktop and than right click and paste. This is just there if anything messes up.
Now download the patch and place it in the C:\Program Files\Sierra\Empire Earth II folder. Once it is there you will than want to extract it to the same folder. Now you should have a file called db.zip (which you can delete) and a folder called db. Leave the db there and the mod should now run.
If you want to uninstall the mod just delete that folder called db. If when you delete that folder you continue to get problems just delete the folder called zips and copy and paste the zips folder you backed up on to your desktop back into the C:\Program Files\Sierra\Empire Earth II folder.
While this shouldn't happen should you fail to be able to run the game still than just reinstall it.