Supports Wolfram Mathematica 12.0 and 12.1
Does not work for other Wolfram products (e.g. Wolfram Player). It’s for Mathematica only!
Update 1 (April 20, 2020): I have examined Mathematica 12.1. No update is required. This utility is automatically compatible with Mathematica 12.1.
Input your MathID (xxxx-xxxxx-xxxxx) and press Generate.