I've found a solution! And I could have forseen it was f****ng simple as hell haha XD Here what was the issue: Directory could not be found due to not complete uninstallation of the mod when I was trying to get it working again. Single files was left in main game directory Skyrim\Data, few meshes, few scripts and txt files of fnis that were still there after uninstalling FNIS via MO2. After deleting these remaining files I've got FNIS to initialize the whole process without errors. To conclude "ERROR(76) Could not find part of the path" might be result of incorrect uninstallation of all mod components. Solution to this is relatively simple so do not lose your minds fellow modders. Hope this post will help to fix this problem if someone is facing it. Here you go with current outcome of FNIS behavior generator: FNIS Behavior V7.4.5 02.09.2018 12:04:11Skyrim 32bit: 1.9.32.0 - C:\Greg\Gry\SteamLibrary\steamapps\common\Skyrim\ (Steam) Skeleton(hkx) female: XPMS2HDT (115 bones) male: XPMS2HDT (115 bones)Patch: "GENDER Specific Animations" Patch: "SKELETON Arm Fix" Patch: "HKX File Compatibility Check Skyrim/SSE" Installing FNIS PCEA2Reading XPMSE V7.2 ( 0 furniture, 0 offset, 0 paired, 0 kill, 0 chair, 164 alternate animations) ...Reading PlayRandomIdle V?.? ...Reading FNISBase V7.4.5 ...Reading FNIS_PCEA2 V1.3 ( 0 furniture, 0 offset, 0 paired, 0 kill, 0 chair, 559 alternate animations) ... All Anim Lists scanned. Generating Behavior Files... 1 GENDER modifications for Animations\male 3 GENDER modifications for Animations\femaleAlternate Animation mods: 2 sets: 45 total groups: 91 added file slots: 1146 alternate files: 723 Creature Pack not installed 743 animations for 4 mods successfully included (character) Cheers!