Guide [SOLVED] Windows 11 .NET 3.5 Error 0x800F081F - CMD Fix for Silkroad

[Atlas]

Are you trying to install .NET Framework 3.5 for Silkroad/mBot, but Windows 11 keeps giving you error codes like 0x800F0950 or 0x800F081F?

This is a known Windows 11 bug. The standard Control Panel installer often fails.Below is the Force Install Method using the Command Prompt (CMD). This bypasses the graphical installer and forces Windows to enable the feature directly.

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Instructions​

Step 1: Open CMD as AdminYou must have Administrator privileges for this to work.

1. Click the Start button.
2. Type cmd.
3. Right-click "Command Prompt" and select Run as Administrator.

Step 2: Run the DISM CommandCopy and paste the command below into the black window and hit ENTER.

Method A: Online Fix (Recommended)Use this if you have an active internet connection. It forces Windows to download the missing files from Microsoft Update servers immediately.

To view the content, you need to Sign In or Register.

Method B: Offline Source Fix (Advanced)Use this if Method A fails. Note: You need your Windows Installation Media (ISO) mounted, or the "sxs" folder copied to your C: drive for this to work.

To view the content, you need to Sign In or Register.

Step 3: Wait and RestartYou will see a progress bar. Once it reaches 100% and says "The operation completed successfully," close the window and Restart your PC.

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Troubleshooting​

• Error 740: You forgot to right-click and "Run as Administrator."
• Error 0x800F081F (Source not found): This means you are using "Method B" but you don't have the sxs folder on your C drive. Try Method A instead.

 

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[DarkMonarch]

Are you trying to install .NET Framework 3.5 for Silkroad/mBot, but Windows 11 keeps giving you error codes like 0x800F0950 or 0x800F081F?

This is a known Windows 11 bug. The standard Control Panel installer often fails.Below is the Force Install Method using the Command Prompt (CMD). This bypasses the graphical installer and forces Windows to enable the feature directly.

---

Instructions​

Step 1: Open CMD as AdminYou must have Administrator privileges for this to work.

1. Click the Start button.
2. Type cmd.
3. Right-click "Command Prompt" and select Run as Administrator.

Step 2: Run the DISM CommandCopy and paste the command below into the black window and hit ENTER.

Method A: Online Fix (Recommended)Use this if you have an active internet connection. It forces Windows to download the missing files from Microsoft Update servers immediately.
*** Hidden text: cannot be quoted. ***


Method B: Offline Source Fix (Advanced)Use this if Method A fails. Note: You need your Windows Installation Media (ISO) mounted, or the "sxs" folder copied to your C: drive for this to work.
*** Hidden text: cannot be quoted. ***


Step 3: Wait and RestartYou will see a progress bar. Once it reaches 100% and says "The operation completed successfully," close the window and Restart your PC.

---

Troubleshooting​

• Error 740: You forgot to right-click and "Run as Administrator."
• Error 0x800F081F (Source not found): This means you are using "Method B" but you don't have the sxs folder on your C drive. Try Method A instead.

thanks