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If you have a Windows ISO or USB drive, you can install it without an internet connection:

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If Windows Update fails, use the offline installer you downloaded above: Open Command Prompt as Administrator. If you have a Windows ISO or USB

Sometimes, attempting to enable .NET Framework 3.5 via the "Windows Features" menu fails. This is usually due to misconfigured Windows Update settings or group policy restrictions. or Windows Server 2012/2016

For older systems like Windows 8, 8.1, or Windows Server 2012/2016 , the offline installer may not work directly. In these cases, you can use your Windows installation DVD or an ISO file: