RTX Packs are available
here; I recommend either of the Vanilla or Vanilla-Normal pack with Clear Water and Luminous Ores add-ons.
Clear glass add-on is also provided here, but I ended up not liking it personally.
Difference between Vanilla-RTX and Vanilla-RTX-Normals:
Vanilla RTX uses 16x heightmaps, which are later converted to a higher resolution (192x) normal map to create an impression of depth on flat surfaces.
Vanilla RTX Normals uses 16x normal maps instead, which define curvature on surfaces and the direction that light will bounce off each individual pixel, also creating a perception of depth and shape.
To me, Vanilla RTX looks cleaner and Vanilla RTX Normals look rougher/more real.