The connection still works but downloading the building data does not.
If its a connection issue then see
IKB: [DO] OpenStreetMap is not working/connecting
Changes to OSM.org have resulted in version 8.0/8.3 and 8.5 no longer being able to use the correct protocols and download the data.
This is now covered in our EKB:
Refer Also to Ticket: openmap download empty
and Floyds copy of reply from Danny:
Prior versions:
See old forum: Lumion 7.5 and 8.0 ONLY: Important Changes to OpenStreetMap