I have found that most of the time the HDR10 and Dolby Vison variants can be downloaded.
So, if the HDR10+ + Dolby Vision hybrid fails to download trying HDR10 as the base layer of the hybrid should probably be tried. Maybe advice to the user this fallback has been used could also be done.
Manually creating the hybrid is tedious and it’s clear StreamFab already has the infrastructure to create these so how about it?