Updated with a link to Microsoft's Windows 10 support page . You’ve read the review , pored through the tips and how-tos , and have waited breathlessly for the day that you can download Windows 10 . So how do you do it, exactly? We've got you covered. Before you do anything, however, we’re going to give your our standard advice: back up your data . Microsoft will give you the option of wiping your files at various stages during the process. Whether you go that route or not, make sure you’ve backed up key documents and other data to OneDrive, a USB key, or something else—just in case. There are three primary ways to obtain Windows 10: either buy a new PC with Windows 10 preloaded, buy a license key to Windows 10 online, or upgrade an existing Windows 8.1 or Windows 7 PC. We’re going to ignore the first option and focus on the latter two, which we’ll consider to be essentially the same scenario. Let’s assume that you’r...