How to Fix Windows Error 0x800f0952 for Free If you’ve encountered Error 0x800f0952 while trying to install .NET Framework 3.5 or other optional features on Windows 10 or 11, you aren't alone. This error typically signifies that Windows cannot find the necessary source files to complete the installation or that a network proxy is blocking the download.

1. The "Turn off WSUS" Registry Tweak (Most Effective for Managed PCs)

Select Other troubleshooters and click Run next to Windows Update.

If none work

The error can also mean the feature you’re trying to install isn’t available for your Windows edition (e.g., trying to install a language pack on Single Language edition). In that case, no “free” fix exists except upgrading Windows edition.

Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU Find UseWUServer and change its value to 0 .

Restart the Windows Update service (or your PC) and try the install again. 2. Run DISM and SFC (The "Standard" Repair)

Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU.