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#11
The Media Creation Tool is used to one of the followings:
1. Download the ISO file.
2. Install Windows 10.
The key point is not about downloading and installing Windows 10, the key point is whether or how to activate it.
If you do that before July 29th, you can use your Win 8.1 key to activate.
If you do that after July 29th, the Win 8.1 key is no good for activation.