Downgrade to 7.2?

I have upgraded my Mac to Big Sur and found eMClient with my free license was not working anymore afterwards.
Simple - just upgrade eMClient? I found the latest version only to learn that this is now available with the free license. I don’t manage to go back now.

  1. downloaded 7.2 but result of installation caused trouble.
  2. deleted eMClient in application folder and some stuff in library folder.
  3. V7.2 Installation finished but program does not start

So, as a result: Is my change to Big Sur the end of free eMClient on my computer? There must be other solutions I guess? Currently I don’t have the budget to pay for 8.2 but hopefully we have some revenue soon which would allow to use this nice, new thing.
In the meantime back to other email clients?