If you are getting this error “0x800f0954” in .net framework 3.5 installations on Windows Server 2019, you can solve the problem by following the steps below.
![3.5 installations](https://www.systemconf.com/wp-content/uploads/2022/12/img_63973b7c1f04d.png)
![.net 3.5 installations](https://www.systemconf.com/wp-content/uploads/2022/12/img_63973b984dbb7.png)
![confirmation](https://www.systemconf.com/wp-content/uploads/2022/12/img_63973baad72dc.png)
![error 0x800fo954](https://www.systemconf.com/wp-content/uploads/2022/12/img_63973bfda0dea.png)
Solving Error 0x800f0954
First, delete the folders inside the CBS file. A CBS file is a file that contains logs for both installed and uninstalled Windows Update components. Right-click on the selected files and select delete.
C:\Windows\Logs\CBS
![CBS](https://www.systemconf.com/wp-content/uploads/2022/12/img_63986f750154a.png)
Secondly, type the following command in PowerShell or cmd and press enter. With this command, we add the sxs file from the iso file.
Add-WindowsCapability -Online -Name NetFx3~~~~ -Source C.\sources\sxs
dism /online /enable-feature /featurename:netfx3 /all /limitaccess /source:c:\sxs
![sxs](https://www.systemconf.com/wp-content/uploads/2022/12/img_63986d3a84cb2.png)
After running the command, .NET Framework 3.5 will be installed on your system without any errors. However, if the problem persists, try the solutions below.
![.NET Framework 3.5](https://www.systemconf.com/wp-content/uploads/2022/12/img_639873987eb62.png)
As the third, log into Regedit. Enter the record below and correct the “UseWUServer” value to 0. Then restart the computer and try the installation again.
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
![regedit](https://www.systemconf.com/wp-content/uploads/2022/12/img_63974d6de1178.png)
![UseWUServer](https://www.systemconf.com/wp-content/uploads/2022/12/img_639840ba47b7f.png)
![UseWUServer](https://www.systemconf.com/wp-content/uploads/2022/12/img_639840e4188f6.png)
![Value Data 0](https://www.systemconf.com/wp-content/uploads/2022/12/img_6398411bd1842.png)