They do offer an upgrade from Start8 to Start 10 which is one dollar cheaper but I am having problems installing it. I have Windows 10 pro 64 bit which was a free upgrade from Windows 8 pro 64 bit. Anyway when I try to install Start 10 upgrade I get this notice: The following minimum system requirements for this set up were not met:
Operating System: Windows 10, Windows Server 10
THE SET UP WILL NOW ABORT.
I had no problem installing Start 10 on my other PC running Windows 10 pro 32 bit version using the regular version of Start 10 and not the upgrade. I'll figure something out.