Most users attempt to install .NET 3.5 through the Windows Features menu, which triggers a Windows Update download. However, this often fails due to connectivity issues or specific error codes like 0x800F0906 or 0x800F081F. An offline installer bypasses the need for an active internet connection by using the installation media you already have. Method 1: Using Windows 10 Installation Media (Recommended)
Enter the following command, replacing D: with your actual drive letter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Most users attempt to install