The updated blender package requires updated blender-fonts package:

$ sudo dnf install ./blender-2.79b-2.fc28.x86_64.rpm
...
Error: 
 Problem: conflicting requests
  - nothing provides blender-fonts = 1:2.79b-2.fc28 needed by blender-1:2.79b-2.fc28.x86_64

$ sudo dnf list blender-fonts
...
Available Packages
blender-fonts.noarch                  1:2.79-6.fc28

Hence, updated YafaRay-blender package fails installation too because it uses the broken old blender package:

$ sudo dnf localinstall YafaRay-3.3.0-9.fc28.x86_64.rpm YafaRay-blender-3.3.0-9.fc28.x86_64.rpm YafaRay-lib-3.3.0-9.fc28.x86_64.rpm
...
Problem: package YafaRay-blender-3.3.0-9.fc28.x86_64 requires blender, but none of the providers can be installed
  - conflicting requests
  - nothing provides libboost_system.so.1.64.0()(64bit) needed by blender-1:2.79-6.fc28.x86_64

The other openvdb, alembic, and YafaRay packages install without problems and seem to be OK.