I wonder if there are potential problems using divi with the download manager? When googling I see a title in the download manager pro forum “Conflict between WPDM and Elegant Themes Divi” but the access is restricted. Since I am using divi and are thinking about getting the pro version this seems important ;-).
The signup is working fine and getting the Welcome email with username and password. But the server is sending the 500 error response for some reason. I have to debug code to find where exactly the error is coming from. Enable plugin editor for the provided user if you want me to dig further.