Here is a breakdown of the unique "SSG 747 on SuprBay" phenomenon:

Furthermore, supporting developers has a tangible return. The legitimate version includes:

: As X-Plane receives updates (like the transition to X-Plane 12), older unofficial cracks may cause the simulator to crash. X-Plane.Org Forum

For a stable and secure experience, you can find the official, supported version and community-made liveries on the X-Plane.org Store or discuss legitimate troubleshooting on the X-Plane.org Forums for the official version or specific livery downloads for the SSG 747?