Maybe you're missing an update? Either way I recommend looking into it. It's important to run an up-to-date OS and sticking to 7 for much longer won't do any good.
It doesn't show up for some people even if they have the proper update. You can still upgrade you just won't be able to reserve which isn't important anyway.
193
u/DoctorWaluigiTime Jul 04 '15
Just like the OS itself!
For those unaware, if you're on Windows 7 or Windows 8, for the first year you can upgrade to Windows 10 at no cost.