As mentioned in my blogpost before, Windows 8.1 Preview is available for download. I choosed to upgrade my Surface RT already, because You'll be able to upgrade to the final edition of Windows RT 8.1 when it becomes available. If you're currently using Windows RT, you won't be able to uninstall Windows RT 8.1 Preview. Just enjoy the new Windows 8.1 experience!
I prefer to create a USB Recovery Drive first. This is very handy when your Windows RT device will not boot properly. It can be used to recover back or repair your Surface RT.
Let's get update my Surface RT. First you need to install a Windows Update which will - after reboot - make the necessary connection to MS Store. After selecting "Download" the update process is starting.
Just wait till the update process is finished. There will be a few necessary restarts during the update process. In my situation it all went fine. After a few hours (didn't watch at time) it was finished.
Just great to have Windows 8.1 Preview ready on my Surface RT now! What I didn't expected is a 3GB more free space available then before (from 12GB to 15GB free space). How's that possible?
First experience seems very good to me!
Update 16-7-2013: If Windows 8 users decide to simply wait until the final version of Windows 8.1 is released, and bypass installing the preview build, the good news is that they won't have to reinstall their apps. Some more good news: Windows 8.1 is expected to use less hard drive space compared to Windows 8, thanks to Microsoft making the move to remove older and temporary files, along with improving NTFS compression. Source: Neowin.net