I just updated 2.04 to 2.08 (to resolve one of the issues I was having. I'm on DNN 8.0.2
The update seem to run fine.
Now the event module is replaced by an error: A critical error has occurred. Please check the Event Viewer for further details.
The event viewer reports this:
UserAgent:Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0
Message:The time zone ID '' was not found on the local computer.