One of the files is out of date. Technically the whole thing is out of date now due to Iceborne changing everything, but I had that same problem. Went into the weapon editor mod (doesn't work now) and updated the file and it worked until Iceborne came out.
its not working for me, i downloaded all, put the pl and wp folders in NativPC and changed the weapon to deviljho in that weapon transmog software as discribed, but nothing changes ingame, exept me having a deviljho caxe instead of my tyrannis 1...
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https://imgur.com/a/EuXzIRO