... section should show you everything you need to start using it.
Runs in .net framework 4.7.2 so you should only need at least Windows 10 1803 to run it.
Crucially, this does not use any web api calls. It can run offline.
I'm not a coder so this isn't error handled anywhere near as well as it should. Source is in the files section.
Built on QRCoder by Raffael Herrmann, released under MIT license.
https://github.com/codebude/QRCode