First of all, unfortunately it still won’t work for me.
I can confirm that I have the “correct” error (copy & pasted from the crash message: Assertion failed: StreamingTextures.Num() == StreamingTextureGuids.Num() ).
When I try to use the plugin again it just tells me “No duplicate texture/material GUIDs found.”
I dug a bit in the logs to find the materials/textures that the plugin did change the first time I tried it, which where the following:
https://pastebin.com/iUeQfZv7