If you have a 32-bit version of Windows 7 or 8.1 installed, you’ll need to install the 32-bit version first to take advantage of the free upgrade. If you’re upgrading an existing Windows system, you’ll have to upgrade from the 64-bit edition of Windows 7 or 8.1. If you’re installing Windows 10 from scratch, you’ll need the 64-bit edition of Windows 10. A 64-bit edition of Windows: Boot Camp only supports 64-bit versions of Windows 10.You’ll then be eligible for the free upgrade. Windows 7 Service Pack 1 or Windows 8.1, if you’re upgrading: If you have the original version of Windows 7 or Windows 8 installed, you can upgrade to Windows 7 Service Pack 1 or Windows 8.1 for free from within Windows.
Before you get started, here’s what you’ll need:
