- Fixes some vertex groups not being merged if the group they were being merged into was missing. This often affected models that were split into multiple meshes. (like if they had hair and glasses as separate parts)
Should work with any Blender version from 2.8 and later, including 3.0+ and 4.0+ (last tested on 4.1)
Save the .zip file somewhere and import it directly into Blender, using the instructions here. No unzipping needed.