John runs the downloaded installer and follows the prompts to install Adobe Acrobat Reader DC. The installation process is straightforward, and he chooses the recommended settings. During the installation, he's asked to choose whether to set Adobe Acrobat Reader DC as his default PDF viewer. He selects "Yes" to ensure that all PDF files are opened with Adobe Acrobat Reader DC.
Adobe no longer offers the Windows 7-compatible version on its main download page. You can: acrobat reader per windows 7