AIUI this is showing the driver setup dialog for the focuser. What may be happening is that the focuser setup dialog is being shown behind the various SGP windows. SGP won't continue until you click Cancel or OK in the invisible setup dialog.
You may be able to tell by minimising or moving the SGP windows before opening this dialog or checking the SGP icon in the toolbar. There may be a second one that shows the setup dialog. Hover the mouse pointer over the icon and see what you get.
Windows changed the way that windows were shown a few years ago and it can now be quite difficult to get something like a dialog to appear on top of the other windows.
Chris R