I have the same version. 1.2.1913.1
So now I went exactly by the book and again re-installed the plug ins again.
About an hour ago I dragged the folders into the UE file and got this:

Now this above is the best result I got all weekend but it's still not very good. So just to be safe I went 100% by the book. I downloaded the plug ins again. I deleted everything from the CC Shaders folder and then deleted the RL content folder. And then installed the brand spanking new plugins again and built the lighting.
Now I am back to flipped normals on the helmet and the spooky eyes character. When I click the pink content and select HQ I don't get an error but UE crashes about 30 seconds later.
Here is a picture of how the helmet arrives now (note this is the helmet version A) I tried yesterday and the day before.
This is the crash report:

This is how the helmet arrives in UE with the normals flipped: