The long wait is over! The Windows 8.1 update for Windows 8 users is publicly available from today!
One can get this update from the Windows Store app, regardless of the device they use. Let it be a desktop, laptop, Surface Pro or a Surface RT you just need to open the Windows Store App to find the update. if the update is not appearing in the Windows Store
1) open Internet Explorer
2) type ms-windows-store:WindowsUpgrade in the address bar
This should open the Windows 8.1 Update from the store directly
Once you open the store and click on the Windows 8.1 Upgrade it will take you to the download screen
Upon clicking download, the download begins and it will upgrade automatically. once the installation completes it will require you to reboot a couple of times and Windows will update with the relevant patches.
Note: It is recommended and a best practice to take a backup of all your files before you begin the upgrade to Windows 8.1