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Home Common Problem How to fix .NET Framework 3.5 installation error 0x800F0954

How to fix .NET Framework 3.5 installation error 0x800F0954

Jul 29, 2025 am 01:18 AM
Installation error

Use DISM with local source by running DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess in Command Prompt as Administrator, replacing D: with the correct drive letter of your Windows installation media. 2. Alternatively, enable .NET 3.5 via Control Panel after running the DISM command to allow the GUI to complete installation. 3. Check Group Policy by opening gpedit.msc and ensuring "Turn off access to all Windows Update Internet locations" is disabled under Computer Configuration > Administrative Templates > System > Internet Communication Settings. 4. Ensure Windows Update and BITS services are running via services.msc. 5. If offline servicing is blocked, open regedit, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate, and set DisableWindowsUpdateAccess to 0 or delete it. The error 0x800F0954 is resolved by providing local source files and ensuring update access is not blocked, allowing successful .NET Framework 3.5 installation.

How to fix .NET Framework 3.5 installation error 0x800F0954

If you're encountering the .NET Framework 3.5 installation error 0x800F0954 on Windows 10, 8, or later, it usually means Windows can't download the required files from the internet during installation. This happens because .NET 3.5 is an optional feature that needs external source files — even on modern Windows versions — and Windows tries to fetch them online by default. Here’s how to fix it.

How to fix .NET Framework 3.5 installation error 0x800F0954

1. Use DISM with Local Source (Most Effective Fix)

The error 0x800F0954 typically occurs when Windows fails to connect to Microsoft’s Windows Update servers to get the .NET 3.5 files. You can bypass this by providing the files locally using the DISM (Deployment Image Servicing and Management) tool.

Steps:

  1. Insert your Windows installation media (USB/DVD) or mount the ISO file.
  2. Open Command Prompt as Administrator.
  3. Run this command (adjust the drive letter if needed):
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

Replace D: with the drive letter of your Windows installation media.

How to fix .NET Framework 3.5 installation error 0x800F0954
  • /Source:D:\sources\sxs tells DISM where to find the .NET 3.5 files.
  • /LimitAccess prevents Windows from trying to reach Windows Update.

? If successful, .NET Framework 3.5 will be installed and enabled.


2. Enable .NET 3.5 via Control Panel Using Local Source

If you prefer a GUI method:

How to fix .NET Framework 3.5 installation error 0x800F0954
  1. Go to Control Panel > Programs > Turn Windows features on or off.
  2. Check .NET Framework 3.5 (.NET 2.0 and 3.0).
  3. When you see an error, don’t close it.
  4. Open Command Prompt as Admin and run the DISM command above.
  5. Return to the features window — it should now complete installation.

This works because DISM "primes" the system with the required files, allowing the GUI to finish the process.


3. Check Group Policy (For Domain or Managed PCs)

On work or school computers, Group Policy might block access to Windows Update, causing the 0x800F0954 error.

To check:

  1. Press Win R, type gpedit.msc, and press Enter.
  2. Navigate to:
    Computer Configuration > Administrative Templates > System > Internet Communication Management > Internet Communication Settings
  3. Make sure "Turn off access to all Windows Update Internet locations" is set to Disabled.

Note: This option isn't available in Windows Home edition.


4. Ensure Windows Update Service is Running

Sometimes, even with a local source, background services must be functional.

  1. Press Win R, type services.msc.
  2. Find Windows Update, right-click, and select Restart.
  3. Also check that Background Intelligent Transfer Service (BITS) is running.

Then retry the DISM command.


5. Use Windows Registry (If Offline Servicing is Blocked)

In rare cases, a registry policy may block offline servicing.

?? Be careful when editing the registry.

  1. Open regedit as admin.
  2. Go to:
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
  3. Look for a DWORD called DisableWindowsUpdateAccess.
  4. Set it to 0 or delete it.
  5. Retry the DISM command.

Summary

Error 0x800F0954 is almost always due to missing source files. The fastest fix is:

  • Use DISM with the sources\sxs folder from your Windows install media.
  • Ensure Windows Update isn’t blocked by policy or network.
  • Avoid relying on internet download if the system is offline or behind a restrictive firewall.

Once you provide the local source, the installation completes smoothly.

Basically, Windows needs the files — give them directly, and the error goes away.

The above is the detailed content of How to fix .NET Framework 3.5 installation error 0x800F0954. For more information, please follow other related articles on the PHP Chinese website!

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