Currently, no iso has been found related to the thx ultimate demo disc, however someone named “laserdisc” or something similar to that had the disc, however i haven’t seen him in a while.
Also, once i get a hold of the iso file i will attempt to find any secret content.
https://i1.wp.com/www.swonvideo.com/dvd/imageslarge/vdvdthxdemo2002front.jpg this is what the cover looks like.
