2.8i has a engine update to the lastest build of Rbdoom3bfg.exe and includes script files to execute for better appearance/speed.
Doom 3 BFG Hi Def 2 8i patch running fast.cfg
obviously you need doom 3 bfg and the Doom 3 bfg Hi Def mod installed
Doom 3 version here
What version of RBDoom3BFG is this running,
and why does the GitHub repository say “RBDOOM-3-BFG 1.1.0-preview3” is the latest thing released, and that was “Feb 3, 2016”?
I just built it myself from the repository, so it is brand new.