At some point during a software installation, a small prompt appears asking you to choose between a 32-bit and a 64-bit version. You probably either guess, panic-Google, or pick the bigger number and ...
Windows 10 going forward will only offer a 64-bit version. It means you need to have 64-bit hardware to install a 64-bit OS. However, there are many computers still running on Windows 10 32-bit OS, ...