The Official Reality forums

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

Its been reported that DIM (DAZ Install Manager) doesn't work on MacOS X Mojave, Tho I believe they are working on a fix (check DAZ forums for more info). As for Reality/Lux I can't say as my Mac is to old for the latest OS Update.

I have a complete tutorial on getting started with Reality here

viewtopic.php?f=23&t=643

Thing to check and try 1. Make sure that you don't have an old version of Reality installed (Installing a newer version of Reality while an old version is installed has been known to cause problems) 2. Completely remove Reality, Download a fresh copy, reboot and install 3. Make sure that both Realit...

That particular product is using iRay's version of Reality's Volumetric Settings and a such have been designed to work only in iRay. To do the same thing in Reality/Luxrender you would need to recreate it using Reality's Materials & a DAZ Studio primitive (like a cube) to contain your atmospheri...

Check to make sure that you have the folders set correctly under DAZ Studio Prefs - Content Manager