Here’s an official link. Search for Special Longer Cut.
https://www.startrek.com/news/fully-restored-directors-edition-of-star-trek-the-motion-picture-arrives-on-4k-ultra-hd
This project is officially over, since it’s being officially released via 4K disc, as GuitarClef stated.
Right down to the audio being DD 2.0 on the 4K disk, meaning it’s the original stereo mix they utilized for that version
They even digitally recreated the transition subs unlike the older 4K disk which just used generic white subs