.NET Framework installation failed because Windows could not connect to the Internet to download the required files

Windows couldn't connect to the Internet to download necessary files.

Windows could not retrieve the required .NET Framework 3.5 payload over the network, usually because of proxy, firewall, offline, or update-service routing issues.

0x800F0906installation

Observed message

Windows couldn't connect to the Internet to download necessary files.

Why it happens

Internet, proxy, or firewall settings are blocking Microsoft Update access.
The device is in an offline or restricted network environment.
The update path is configured incorrectly for optional component downloads.

How to fix it

Test connectivity to Microsoft Update from the affected machine.
Review proxy, firewall, and outbound filtering configuration.
Use local installation media if the machine cannot download the files directly.

Official reference

.NET Framework 3.5 installation errors

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