As of today, when I launch Unreal Engine 4 I get the error: No version information received.
From the log, it appears that authentication completes successfully. However, a 500 server error is received when querying:
https://launcher-service-prod06.ol.epicgames.com/launcher/api/buildManifest/launcher/latest?label=Production&platform=Windows
I can hit OK, and open the launcher anyway. The result is that all example content launch and download buttons are replaced with a link labelled ‘Subscribe to download’ which opens the unreal engine dashboard webpage.
My subscription is currently active.