Hi ,
- Does this occur if you attempt to open editor via your projects .uproject file? You can get to your project through filepath \Unreal Projects\PROJECTNAME\PROJECTNAME.uproject.
- What are exact steps you are taking before this error occurs?
- Are you on a proxy server?
- Can you post your dxdiag here so I can take a look at it?
- Does this occur with any other editor versions or is it limited to 4.8.3?