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How to upgrade to Windows 8 Consumer Preview (via USB)
1. Download Windows 8 Consumer Preview in ISO format here
(be sure to choose correct edition – 32 or 64-bit)
2. During installation (later) the software prompts for an installation key so, run the Windows 8 Consumer Preview Setup from here, let it do its app check, click Next, and you’ll get a product key – take note of that – then cancel out
(thanks to tip from here – note that at this point a Download Windows icon is on the desktop and this may download files and give you the option to copy to USB – I just chose option in point #1 above – so let me know if this works as well)
3. Download and run the Windows 7 USB/DVD download tool from the Microsoft Store
(found in Programs menu)
4. Select ISO file from step 1
5. Select USB drive
6. Insert into machine to upgrade (in my case a Windows 8 Developer Preview; yes you can upgrade that) and run Setup
-Krip