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What version of Windows 10 is it? v1909 and older are beyond retirement date. The latest version can be downloaded here.
https://www.microsoft.com/en-us/software-download/windows10
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According to your screenshot, current system is Windows Server or Enterprise editions, for these two editions of Windows 10, you cannot upgrade by Windows Update assistant directly, you need ISO image.
Please contact your system admin for help, if you are admin, visit VLSC or Visual Studio subscription to download the latest Windows 10 21H1 ISO image to in-place upgrade.
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