The original was made by Fat-Alfie and was built with LiDAR data. While it never quite got to 1.0, I am sure it is of substantially higher quality than anything ACTK will put out.
The reason it was pulled from RaceDepartment and scrubbed from the internet was that the actual owner of the Bilster Berg himself went on a litigation rampage once he figured out people were making versions of the track that weren't using his license, which if I recall correctly cost thousands of dollars. He threatened to sue, and that was that, obviously - despite the LiDAR data being very much legally obtained. This is my recollection - feel free to correct me if I'm wrong in some small details.
From what I understand, only RaceRoom has this licensed version of Bilster Berg, and word is that Fat-Alfie's is superior even to that one.
There are a few small CSP issues with the track, but it's brilliant in slower tin-tops and open wheelers. I'm not sure it's possible to find it out "in the wild" anymore.
EDIT: Check the Breathe spreadsheet. You may or may not find a copy.