Struggling to find a recording of the THX Deepnote in an actual surround sound format.

Coworker is building one of the fancier surround sound setups, and mentioned we wished he could find the THX Deepnote in full surround sound. Seemed like a simple enough request, so I did some searching myself, and am only seeing YouTube videos like this one, or .mp3 files, both of which (afaik) only support two audio channels.

Even THX's own website just links to more YouTube videos.

I don't actually know jack about surround sound or audio formats - taking his word and the web articles I've stumbled across all at face value... am I just being stupid about this? Is there somewhere to download the full-quality thing?