This is an update that fixes the StudioDecal issue.
v0.3 is an update that contains a repo rebase and fixes the StudioDecals bug. They are working as intended now.
v0.3.1 applies some fixes from Solokiller and LogicAndTrick. Also a crucial fix for a weapon retirement crash.
I'm still investigating the cause of the mandatory models folder. I'll post another update if I fix the problem.
You can just download and use mod files, or you can build your own DLLs from source code with VS2019.