Added version system, using deprecated versions are not available since used libraries are slow and youtube is making a lot of changes.
You can also use any version you want or like because that's the beauty of open source software's.
Quality of the mp3's got better and better after transferring the script to using yt_dlp instead of the old pytube (minor changes to download protocol).
Size improvements, from 100mb to 56mb (pyinstaller is still trash but it is what it is, I won't rewrite in C#, because it's not used this much)
Full Changelog: v2.0...v2.1