Hello!

Please note that this issue has already been resolved. I am just posting the solution here in order to help other people that might run into the same issue.

I was having trouble getting the Slimbook RGB Keyboard control application (https://slimbook.com/en/blog/guides-2/post/slimbook-rgb-keyboard-277) to run on my Slimbook Creative, running fully updated Fedora 42 Workstation. When I clicked the Icon in the Gnome Applications grid, seemingly nothing happened. I was having this issue for a while, then I decided to try installing it again, from scratch.

I removed every installed package from Slimbook, added the repo for Fedora 42 again and followed the instructions for installing the app (it can be found by following the link I mentioned earlier). It did not work.
I then tried to launch the app through terminal, by using the command 'slimbookrgbkeyboard', and ended up with an error:

ModuleNotFoundError: No module named 'slimbook'

I saw that the file generating the error was a Python file (/usr/share/slimbookrgbkeyboard/src/slimbookrgbkeyboard.py), so I decided to look for anything python related in the Slimbook repo. I found and installed 'python3-slimbook'.
This got me past this error message, but now it threw another error:

OSError: libslimbook.so.1: cannot open shared object file: No such file or directory

Again, I looked through the repo, and found and installed 'libslimbook1'.
Now its working like a charm.

Seems like libslimbook1 and python3-slimbook is either missing in the installation instructions for Fedora 42/Gnome, or it is missing in the dependency list of the package slimbook-rgb-keyboard. 🙂