The free upgrade from Windows 7 and 8 to Windows 10 is available now on Windows update. Those of you who've reserved your copy may find that your Windows Update is already offering to install the new operating system, though the release is staggered, so you may not get it just yet.

Much to my surprise, upgrading my own system from Windows 8.1 to Windows 10 was more or less flawless, and the upgrade is a great deal more convenient than a fresh install. If you want to do a fresh install, or want to upgrade but don't want to wait for Windows Update, ISO images are now available, too. The final Windows 10 release is also now available on MSDN for subscribers.

While you're waiting for the download, why not read our review?