Problem with Mithership Service Rooms Environment

The assets seem to be present here: C:\Program Files\Epic Games\Launcher\VaultCache\MotherShipRooms\data\Content
But they won’t be added to project properly. Please investigate! I am using ue 4.8.3. I believe the launcher did update himself without asking my permission several times.

Is there a fast possibility to add this content to a project (without to download it again)?
Thanks!