This is the question raised by many users since yesterday when Laminar released XP11.50b1 which introduces Vulkan.
The Reality Expansion Pack is supposed to work out of the box with it. By the way, we do not provide official support of XP11.50 until its stable release.
We’re working with Laminar to fix the bugs introduced with XP11.50 and meanwhile, we’re testing REP with it.
Does REP work on XP11.50 Beta?