: Platforms like eBay are common for finding physical "New Old Stock" (sealed boxes) or used copies with a Certificate of Authenticity (COA) sticker.
: If you have an old PC with a Windows 7 sticker on the bottom, you may be able to use that product key for your MacBook installation. Check Your MacBook's Compatibility buy windows 7 for macbook
Since Microsoft no longer sells Windows 7 directly, your options are limited to third-party resellers or used marketplaces. : Platforms like eBay are common for finding
Before you buy, confirm your MacBook can actually run Windows 7. buy windows 7 for macbook