Discord Server:   / discord  
AutoRigWeld Code: https://pastebin.com/8zX9dMyj
Rig Cleaner Code: https://pastebin.com/xePmpkb5

00:00 Introduction
00:49 Script Demonstration
01:41 Step 1. Strip Rig (Can be optional)
02:41 Step 2. Build over rig
03:11 Step 3. Group the model with associated limbs (CRUCIAL)
04:39 Step 4. Run the AutoRigWeld Script Select the Target then the model
06:46 Welding rigs other than R15 or R6

Clarification:
I don't think the audio was clear but the order of selection when you run the autorigweld script matters, you need to select the animation rig and then the model over it.
Also, I kept on calling the command line a "console log", in the video, that was a little embarrassing.