Various Gamebryo SDKs that have been released over the years.
gamebryo_1.2.7z sadly seems incomplete, this should be the full source for 1.2 but is missing a lot it seems.
I think this originally came from a gamebryo_1.2.rar file which was about 300MB bigger, but unfortunately can't find that now. (also seems like that rar file was likely the extracted contents of some GbSourceSetup.exe installer/disc, which also doesn't seem to be available anywhere...)
Apparently there's also releases of 2.3 / 2.3 education / 3.1.1 / "kickstart" around, but I couldn't find any working links for those neither.
October 12, 2020 Subject:
Hello, first of nice release! I myself have a working version of Gamebryo 2.3 and 3.1.1 with kightspeed and Kickstart. I am searching for Gamebryo 2.0 since years to properly 3D Model on an old game. My versions work because I have someone that removed the licensing code off of them.
Please contact me per e-mail if you are interested: email@example.com