Perfect solution to the problem of Windows Server 2012 or 2016 failing to install .NET Framework 3.5 without disk

Problem Description

When using Windows Server 2012 R2 or Windows Server 2016, an error message is displayed when installing .NET Framework 3.5.1. The error message is as shown in the figure below.

Cause Analysis

The installation source files could not be found.

Solution

You can use the following PowerShell script to install it.

Find PowerShell from the Start menu, right-click it and select Run as administrator.

Enter the following script and press Enter to execute it.

Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU' -Name UseWUServer -Value 0
Restart-Service -Name wuauserv
Install-WindowsFeature Net-Framework-Core
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU' -Name UseWUServer -Value 1
Restart-Service -Name wuauserv

Notice:

1. Windows Server 2012 and Windows Server 2016 have high memory usage. Installing other applications will increase memory consumption, which may cause insufficient memory and installation failure. Therefore, it is recommended to increase physical memory. If it is an IO optimization instance, you can enable system virtual memory as appropriate.

2. If the installation reports an error message: 0x800f081f , please check whether the public network is normal. If it is normal, the update failure may be caused by an unstable link to the Microsoft update server. It is recommended to change the time period and try again.

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