At the moment there is no need in manually entering the product key. It is my understanding the product key is programmed into the installation, and will be removed before releasing to OEM. So for the moment you don't need to worry about the key.
basilica,
Which product key did you use ?
For Pro version ( non - enterprise ), the key is :
6P99N-YF42M-TPGBG-9VMJP-YKHCF
For Enterprise version, the key is :
VTNMT-2FMYP-QCY43-QR9VK-WTVCK
Furthermore, did you download the ISO from the Windows Insider website by logging in, or did you download it from a torrent site?
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