SSG, also known as Supercritical Simulations Group, has recently released a hotfix for their 747-8 Inter Anniversary Edition addon for X-Plane 11. The update mainly features a fix for the sound plugin in the aircraft, but also compatibility with X-Plane 11.50b9+ while still with X-Plane 11.41.
Primarily the update is focused on the DreamEngine sound plugin so that sounds are now working properly.
The very same update has been also released for the SSG E-Jets series, also for X-Plane 11. Both updates can be downloaded via the SkunkCrafts updater.