I switched completely to Linux 3 years ago. Linux Garuda to be precise.
In those 3 years I only had to do something in the console 3 times because something was stuck in the system. Apart from that, everything works directly via menus.
In other words, I'm not really sure how to get a Windows bat file to run on Linux.
But I was able to unpack the files on Linux with the tool:
https://f95zone.to/threads/unren-for-macos-and-linux-v0-8-2.16887/
Here is an example test with Emma's body, original on the left, two tanning attempts on the right:
	
		
			
		
		
	
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It gets tricky with the pictures where clothes are in the picture.
For example, the tights with the holes.
Or the feet with the lacquered toes. Changing the colour without the clothes or toenails changing colour.