Updating from 6.0/6.1/7.0 to 8.0, you need to do this! 
1. The first thing you will need to do is open up Data.ini and look for a line that has BLENDDATA under [CLOTHES-MISC]
2. your blend data should look somewhat like this BLENDDATA = 40-1-21-19-10-34-1.6-1-1.4-false, 
3. if you have underlines ( _ ) instead of dashes ( - ) you are fine, if you dont you need change them to Underlines, as follows
   BLENDDATA = 40_1_21_19_10_34_1.6_1_1.4_false, 
4.save and close the file
5. Create 4 new folders named "Char_Franklin", "Char_Michael",  "Char_Trevor" & "Char_Other" (without quotes)
6. next you need to Copy and paste Data.ini, CompanionWeapons.ini, Preset_Outfits (folder) and Yacht (folder) into each of the new character folders, there should be these 4 files in each of the 4 new character folders 
7. done!, you can now replace the DLL and PDB in scripts


or Watch https://www.youtube.com/watch?v=lB7oDUxFXsQ