Is the free upgrade to Windows 10 64bit?

The free upgrade to Windows 10 typically refers to the upgrade from Windows 7 or Windows 8.1 to Windows 10, and it can include both 32-bit and 64-bit versions, depending on the version you are upgrading from. If you are running a 32-bit version of Windows 7 or 8.1, you will receive the 32-bit version of Windows 10; similarly, a 64-bit version will upgrade to 64-bit Windows 10. To take advantage of the 64-bit upgrade, your hardware must support it.