These are shapes. You can view them when import model and vta in blender.

import smd instead

Początkowo opublikowane przez Barawasz:

Początkowo opublikowane przez xdshot:

Weapon model with armature are imported as separate object and have bones copy pose constraints added that are targetting to playermodel bones

So, is there any option to fix this? (Like moving/deleting model bones) Or should I manually move the model and try to fit it as it is now?

It's not error by design. You just import it separately.

Weapon model with armature are imported as separate object and have bones copy pose constraints added that are targetting to playermodel bones

ERROR: [Errno 2] No such file or directory: 'C:\\Users\\throw\\OneDrive\\Documents\\blender\\models\\vtuber\\f_c_body_LOD0.smd.dmx'

It literally tells...

https://github.com/REDxEYE/SourceIO

It's SourceIO, not source tools. You should redirect it to SourceIO author instead

Link is broken

When it happens?

Put definebones lines