The Official Reality forums

Instructions for un-installing Reality 4 can be found here http://preta3d.com/wiki/doku.php?id=uni ... io_edition

Did you completely remove Reality before re-installing?

It’s under the presets menu

What do you have in the scene inside of DAZ?

Goto you Account on DAZ3D and click on Serial Numbers & you should find your Reality Serial Number listed there.

In Reality 1st click on Render then on Texture Collection then Enable Texture Collection & finally make sure that Original in selected.

Now when you export your files from Reality it will collect all required textures a place them in the output folder structure

Its a well known bug with the Reality Plug_In, The way to get round this is to convert the Instances into physical geometry using https://www.daz3d.com/instances-to-objects

It seems that those particular presets are empty on mine as well

Try the following, Delete the Mesh Light, Close Reality, The press CMD+Z to undo the delete, Re-Launch Reality

Try setting the Negative & Positive to 0.0003, Select Use Micro-Facets & set the SubD to 200 as a starting point