Version Version 2512 (12955) is not tracking emails.
I ticked the beta version and have stopped Mac from downloading remote content.
Thank you for writing to us. If you were on the beta version and Tracking was not working, we have since released a NEW beta version that solves this problem. You can download it from here:
If you are using Apple Mail and are a Mojave or Catalina user, you will also need to reactivate Mailbutler in the Plugin Preferences.