To update Windows 8 to Windows 8.1, browse to
on your Windows 8 device. Click on the "Get it now" button. After that, on the Download Windows 8.1 Preview page, click on the "Get the update" button. (Note: You will only see this if your system is running Windows 8.) Here, you're prompted to open or save a file with an extension of ".msu"...
You can open the .msu file directly; otherwise, download it and then double-click on it to install it. At that time, you're asked to install an update for Windows—click Yes. After the installation completes, you'll be prompted to restart your PC.
When you do, Windows restarts to install the new update. Log back in to Windows 8 from the lock screen, and you should see a message inviting you to get Windows 8.1 Preview for free. Click on the link to Go to the Store, where you can download the update.
