I originally purchased and installed the disk version, 3 years ago, which requires that the game disk be in the optical drive while playing. I want to play without having the disk in the drive. Having already installed the game and playing from the disk, is it possible, to purchase and install the digital version of ESO, so I would no longer have to keep the game disk in my XBOX? I'm not tech/XBOX savvy, so dumb it down for me. Thanks.