Step 1: Download the Windows 10 ISO image from Microsoft’s web site. Alternatively you can download the web installer from the same page and just choose to upgrade your PC, which is the easiest option.
Step 2: If you are installing on a regular PC with Windows already on it, you’ll be prompted immediately to start the upgrade process. Alternatively, you can burn it to an optical disk or create a bootable USB flash drive. Otherwise, just attach the ISO image using the virtual machine software of your choice (assuming your virtual machine already has Windows 7 or 8 installed).
Step 3: Install it mostly by clicking the Next button, making sure to choose Upgrade when prompted. If you want to clean install, follow our clean install instructions instead.
Note: Now that Windows 10 is released, you’re going to need a valid Windows license key for 7, 8, or 8.1 in order to perform the upgrade.
For posterity, here are all of the installation steps if you’re booting from a flash drive, although you could just remember the word “Next” and get through it fine. Just remember to choose Upgrade when prompted unless you’ve previously upgraded and activated Windows 10 on this computer.
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