@cole-morton I assume you have version 6.9. If so, when setting controls, make sure you're not assigning buttons to the controls with "+" and "-" next to the control's name. Scroll down until you see the same controls without the "+" and "-".
@braceru31 The server runs in the background, so you won't see it open. If you look in the Task Manager, an instance of HydroSim will be running. That's the server. You can then open the game with your main shortcut and use your server.
Sounds like you may have pulled the HydroSim.exe out of the folder group for an easy access shortcut, not sure, but it's been done by a few. That error message will show up if you do that, the HydroSim.exe must be opened in the folder group. Re-download and overwrite it again and try opening the HydroSim.exe where you find it, don't move it. you can always pull the whole group to the desktop if needed.
I would recommend using the Logitech Gaming Software with the following settings (degrees of rotation is personal preference).
As for the pedals not working, it might have something to do with the USB port it's pugged into. I had the same issue with my G27 recently and was able to fix it by moving to a different USB port. Since you're on a laptop, there may not be another port available.