Windows 10 can run on both 32-bit and 64-bit processor architectures. If you have a computer with a 32-bit setup, you can upgrade to the 64-bit version without acquiring a new license. The only caveat ...

So I bought a used HP business desktop from microcenter and it has a 64-bit Core 2 Duo installed. Of course, the people at microcenter had to put 32-bit W7 on it (64-bit was installed previously, from ...