>>385709080
unzlp them first, then install auto-rig_pro-master.zip, rig_tools.zip and proxy_picker.py from the preferences window
again, none of this will help you if you don't already know what you're doing; the plugin will only be useful if you're making models from scratch or turning random unrigged models into VRC avatars
if you're just starting out I would suggest using an already rigged character so you can figure out the Unity side of things