I had just a thought about this the other day. We are past the free upgrade period, but what has it been replaced with? It seems now there is no upgrade option. It would be silly to think that MS would do all this work to change Windows Update to allow in-place upgrade from Windows 7 and 8.1 to Windows 10 just to disable the upgrade thing when the free period ended. No I think it would make more sense that it would still remain and get replaced by one where you could purchase the upgrade. That doesn't seem like it exists right now which is kinda surprising.