In response to post #98005353.
Vortex is a bit fucky on anything other than super open source games like Skyrim and Fallout.
Manual is really easy though. Simply install SuperBLT for your game to be able to unpack and load the assets, and in your root Payday 2 folder make a folder called "Mods." Put BLT in there, and then any mod you download needs to be extracted to that folder. Don't move anything from these folders, just make sure everything is in "Mods" and their respective parent folders.