For those still interested, my files are here for now: http://www.spellborn.nl/sb-files/
The files Getty used are in the custom folder.
The TCOS SDK were made by someone else.
If you use the ue-explorer, you can partially read the scripts from the u files.

From what I understood from one of the original SB dev, the scripts are incomplete as a lot of code was ported to the DLLs.
The UT custom download is 8,45 GB in size.

I hope this helps.

Respectfully,

Acid-Burn