Hello,
Sorry to hear you are having issues. But, I just checked mine also on Windows 10 but the check update stay off when I reopen Groupy 2 configuration Windows. Try this, uninstall Groupy 2, reboot immediately after uninstall finished. Re-download Groupy 2 latest available install. Install it. Reboot again after installation finished. Retest it and report back.
Thanks
Basj,
Stardock Community Assistant.