I'm new and I need help

Hi.
In s4s settings change Blender path to blender.exe in blender 4.1 installation folder. Clone something, export the blend, open, check if s4studio mesh tools appeared. If yes, then everything is fine and whatever problem you're experiencing is not related to blender's version ( unless you opened a file created in old blender in new one, then yes, cannot jump between them )
Share your blend file and the package in which you cannot import it