Hey, I discovered your player and made a fork of it with Windows and a new design:

https://github.com/TheRolfFR/ElectronPlayer

New design I made

I use Castslabs version of widevine.
The only problem is that legally we can run it in developer mode but in production we must ask Widevine to provide a license to sign it.
If some of you wants to help me, or else please respond to this "issue".

Thanks in advance.