Here’s the reply from tech support for anyone else who is asking, where is the tex folder in R16. Short answer…. it’s gone by design.
Tech support:
“You’re not missing anything. R16 doesn’t have a tex folder built into the installation folder like the previous versions did. All texture files the R16 Content Browser presets may use are fully embedded in their .lib4d library files now.
You can always create a tex folder in the R16 install folder if you need it, and it’ll work like it did in past versions. For example, I know the GreyScaleGorilla Light Kits require you to put some textures in the tex folder. If you are using this product, or something similar, you should create your own tex folder and drop all the needed textures within it.
I hope this helps. Please let us know if you need any further assistance.”