I'm currently using SPSWin version 4.0. My XP machine is about to pack it in, will the newer version work on Windows 10 ?
Yes, the latest version will work on Windows 10. The developers have stated in the user guide that the software requires Windows 95 or higher which means you can install it in Windows 10, but before doing that, make sure to run the installation package as Administrator.
Download page: https://www.liftmaster.com/SoftwareDownload