For Windows 10 and Windows 8.1, you can download the ISO images without needing a product key. You have to enter that once you start the. Whether you have a Windows 8 DVD or a Windows 8 ISO file you've downloaded from Microsoft, you can use a free Microsoft tool to copy the. Why Microsoft gives us the option to create an ISO of the 8.1 update, but doesn't allow the use of our existing Windows 8 key (it's a free upgrade.
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