The keyword typically refers to a custom, pre-activated ISO image often released by third-party groups like "Generation2" (Gen2). These releases bundle specific Windows 10 editions with integrated updates up to a certain date (in this case, June 2021). Breaking Down the Keyword What's new in Windows 10, version 21H1 - Microsoft Learn

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Find your Certificate of Analysis or Certificate of Quality by either lot number or catalogue number.

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The keyword typically refers to a custom, pre-activated ISO image often released by third-party groups like "Generation2" (Gen2). These releases bundle specific Windows 10 editions with integrated updates up to a certain date (in this case, June 2021). Breaking Down the Keyword What's new in Windows 10, version 21H1 - Microsoft Learn