[yboris]

I created Video Hub App - https://videohubapp.com/ (Electron app)

I sell per download for $3.50 minimum (users can pay more if they would like). It was released last year around the same time and now has 473 copies sold. Late last year I made it open source: https://github.com/whyboris/Video-Hub-App

Unsure if anything I shared is valuable to your situation. I chose against using licenses / serial numbers / etc - fewer headaches. Makes the user experience better I suppose.