I am now playing Rhem II SE and I am using the walkthrough of Marinus-Louis, it is in Dutch and it is not on his website at this moment.
Send an email to Louis to ask him.
After I finish the game and have discovered what the new part is and the solutions for the new puzzles, Louis will combine this with his walkthrough and then put it on the website.
On this moment is on the website the walkthroughs for Rhem I SE and Rhem IV SE, they are in Dutch.
I am planning to translate these walkthroughs to English.
Look at the website www.pcgameswalkthroughs.nl
there you see the name Louis Koot in blue, click on it and you can send an email to Louis.