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Windows 11 does include .NET Framework 3.5 by default. While you can enable it via Windows Features (requiring an internet connection), that method often fails due to network policies, corrupted caches, or update server timeouts. Keywords used: download net framework 3
For more information about the .NET Framework and troubleshooting tips, check out the following resources: Windows 11 .NET 3.5 offline
Method 1: Using the Standalone Installer (Windows 11 Build 28000+) Starting with Windows 11 version 26H1 (Build 28000)
Open your browser and go to: https://www.catalog.update.microsoft.com/Search.aspx?q=KB5011048