Updating Windows 8 to Win 8.1 Preview

I have an Apple iMac 27" with Windows 8 Pro on a bootcamp partition with all the latest updates installed.
I downloaded the KB2849636 Update, and Win 8.1 appeared in the Store.
I downloaded the Win 8.1 update and went through several restarts with the "beta fish" startup screen, from "setting up" to "getting devices ready" to "applying changes".
But then, after the last restart the screen just went blank black with no response.
I forced one more restart, and got a startup screen which said "restoring your previous version of Windows".
After Windows was restored to Win8.0, there was a popup "Sorry, we couldn't complete the update to Windows 8.1 Preview. We restored your previous version of Windows to this PC.
0xC1900101-0x40019."
Have anyone else experienced same issues? Does it in any way have smth to do with BootCamp?

If your install failed you probably were using a preview version of Windows 8 or a borrowed Windows 8 key. If you had a properly activated version of Windows 8, you would not face the issue.
The work around is to download the ISO version http://windows.microsoft.com/en-us/windows-8/preview-iso and find the product key in FAQ or NTTX3-RV7VB-T7X7F-WQYYY-9Y92F to activate Windows Blue.
You dont need a bootable disc - run ISO directly from its downloaded folder. I've done this on my iMac and Macbook Air.
Macs are the best thing that have happened to Windows 8 and vice versa.

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