In a moment of weakness, I ordered the retail Windows 8 Pro Upgrade Media from an online vendor and I received it yesterday with both 32bit,64bit media and Key.
I made a Custom install with the 64bit media on a 80GB partition created and formatted with Windows 7 Home Premium 64bit Windows 7 Disk Management - a clean install with DELL OEM Reinstall Disk - on my Dell lappy.
Since it was an upgrade media, I followed Brink's tutorial refreshing it after the first install. Everything went on well and Windows 8 Pro activated without any hitch.
After reading that many users who had bought the media from the vendor were able to do a clean install even on a new HDD, I decided to try it.
So I reformattedd the partition and installed the Windoes 8 Pro and what a surprise! It activated automatically without any hitch and what more now I have a dual boot system with OEM Windows 7 & and Windows 8 Pro.
I also observed, when I followed Brink's tutorial and installed Win 8, the windows.old folder contained 1.32GB files and with the later clean install though there was a Windows.old folder it was empty.
The media purchased from the online vendor is distributed by a Microsoft authorised distributor and replicated in Singapore.
EDIT: OMG, I posted this Windows 7 forum, instead if eight forum.