You cannot rely on "one-click" buttons inside your browser. You have to go external.
Because official support for Windows 7 ended in 2023, you must use a browser that still receives security updates to ensure YouTube works correctly. download youtube windows 7
: For downloading videos for offline viewing rather than just "installing" the app, third-party software like YTD Video Downloader is often used, but use these with caution due to potential security risks on unsupported systems. You cannot rely on "one-click" buttons inside your browser
: While Firefox doesn't use the "Install" button exactly like Chrome, you can create a shortcut by dragging the padlock icon from the address bar directly onto your desktop. download youtube windows 7