After some research, John discovers that Adobe Acrobat Reader DC (Document Cloud) is the latest version available, and it's compatible with Windows 7. He visits the Adobe website and clicks on the "Download" button to get the installer. He chooses the correct language and architecture (32-bit or 64-bit) to match his Windows 7 installation.
“Acrobat Reader cannot run on this version of Windows. Please update your operating system.” acrobat reader per windows 7