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I'm using the final version of Xcode 10 on macOS Mojave beta 11. I downloaded the Additional Tools for Xcode 10 package from Apple's website.

When I try to install the Network Link Conditioner Preference Pane, Settings.app displays this error:

“Network Link Conditioner” preferences is installed with macOS and can’t be replaced.

However, the preference pane is not visible inside Settings.app. I even checked under /Library/PreferencePanes - it's not there.

enter image description here

How can I get around this?

Douglas Frari
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Tamás Sengel
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    it was in your own Prefpanes directory at ~/Library/PreferencePanes and apparently those don't show up in System Preferences anymore – Martijn Scheffer Mar 07 '19 at 09:27
  • @MartijnScheffer It seems like that is the case, yes. I've added this information to my answer. – Tamás Sengel Mar 07 '19 at 17:08
  • Network Link Conditioner doesn't work on Catalina (Correct Answer by KMT on Oct 25, 2019 8:30 AM). See at https://forums.developer.apple.com/thread/125000 – Douglas Frari Dec 13 '19 at 12:21

6 Answers6

241

I ended up manually copying the .prefPane file to:

/Library/PreferencePanes

After restarting Settings.app, it finally appeared on the list and worked perfectly.

As Martijn Scheffer stated in this comment, the reason for the pane not appearing in System Preferences is that the installer incorrectly puts the file to ~/Library/PreferencePanes instead of /Library/PreferencePanes.

Download in https://developer.apple.com/download/more/ Additional Tools for Xcode 10.1

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Douglas Frari
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Tamás Sengel
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Network Link Conditioner is already installed but you can't see it on the Settings App. This worked for me:

  1. Press Command + Space to open spotlight
  2. Search for Network Link Conditioner
  3. It will appear on the result, click on it and it will open Settings app.
  4. Network Link Conditioner is now visible in the Settings App. Open it from the Settings app.

Hope this helps!

meow2x
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+1 to brainray, what worked for me was:

  1. Download new Network Link Conditioner
  2. Replace the old one in /Library/PreferencePanes
  3. Open Network Link Conditioner directly from /Library/PreferencePanes

It now appears in my Settings app

Lauren Caponong
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In case the NLC is freezing when turning it on in the preferences it's important to note that it has to run as admin.

With the following command the preference app from MacOS can be started as admin:

sudo /Applications/System\ Preferences.app/Contents/MacOS/System\ Preferences

See here: https://stackoverflow.com/a/36445625/4417912

Jim B
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Update on the answer June 2019 Xcode 10.2

Apple has moved Network Link Conditioner Tool to additional tools for Xcode

Go to the below link

https://developer.apple.com/download/more/?q=Additional%20Tools

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Install the dmg file, select hardware from installer

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select Network Link conditioner prefpane enter image description here

Suraj K Thomas
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Double clicking the Network Link Conditioner.prefPane in the Additional_Tools_for_Xcode_x.dmg worked for me - it appeared in the Settings after asking for permission to install.

Przemysław Wrzesiński
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