Your download may have been corrupted or messed up due to one of a few things.
1. WinRAR messed it up due to connection problems
2. Your internet connection gave out but still preformed a "complete" download (this has happened to me)
3. The download you chose may have been corrupted
4. You lost connection during the download/upload process
To fix this all you need to do is hover over the EPW folder right click "DELETE" recycle it and re-download or run elementclient.exe and administrator. Hope my input helps.