Bei mir geht es. Versuch mal dies. Hat bei mir geholfen.
The Operations Center is back operational. A manual update is needed in order to download the latest working version. Follow the below instructions to update it.
Go to to C:\Users\{username} \AppData\Roaming\PMDG\PMDG Operations Center right click on OpsCenterUpdater.exe and select run as administrator. This will update it to the new version