One of our former members, Jetrell Fo, has acquired the CD-ROM Cinema DTS discs of all the Star Wars films, I-VI, and has shared them to the community.

You may read about our usage here:

https://originaltrilogy.com/topic/The-1997-Star-Wars-Special-Edition-Trilogy-Preservation-Standards-Thread-Work-In-Progress/id/14647/page/1

and here:

https://originaltrilogy.com/topic/Star-Wars-1997-DTS-CD-ROMs/id/14241/page/1

I’ve acquired them through via download from the usenet circuit in the form of an ISO disc image.