Oh FFS. You NEVER had to enter a key any way for previous upgrades. You just had to have the media. Why are YOU finding it so difficult to understand?
An upgrade has always been a full version for every version of the MS O/S I've owned since W95.
ok once win10 is released go head and do a clean installation straight away..
but don't come back saying oh why can't i get it to activate.
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I won't try the preview then. Hopefully will be working for the official release or shortly after. Don't suppose Microsoft will improve narrator for Windows 10.