Since you are a part of the Denodo 8.0BETA program, someone from Denodo will reach you directly to discuss this.
With that said, please make sure that your License Manager and Solution Manager servers are up and running. In HTTP a 500 error is defined as: "Internal Error 500. The server encountered an unexpected condition which prevented it from fulfilling the request." Therefore, this error indicates that the error comes from the web server side. Can you please check if the web server is working without any issues?
Hope this helps!