2018 Professional Edition Upgrade Key
Given that the original dev seems to have wanted to make the full version available to everyone before disappearing, I'm putting a valid license key/info here - if someone wants this removed, feel free to get in touch and I'll take it down.

Full Name: Kevin Schuchmann
Email Address: your email address
Upgrade Key: CGHZ-PP9G-EAJZ-AWKK-NDNX