Ok, i think i found this issue and wanted to share my infos about.
First of all thanks to Raduziel for the awesome work on an awesome mod.
The problem comes out after an installation of EET on a 2.5 patched game. If you check the KITLIST in your override directory, you would notice that the GRIZZLY_BEAR kit got an extra 0x00004027 column.
Extra becouse the previous one is 0x00004027 aswell.
Just delete the last "extra" column and restart the installation of the mod. Everything will go fine then.
I think the problem is in the patch itself BTW.
Hope to help, I m testing loads of EET installations around this mod and I will share any finding.