“System Extension Blocked” warning during installation on macOS 10.13 High Sierra

by Dániel Alexander Kovács · updated: 10.06.2017

Affected versions: All | Severity: not a Bug, workaround applicable | ID: 229504


When you try to install ARCHICAD, BIMcloud or the License Manager Tool on your newly installed macOS 10.13 High Sierra for the first time, you are prompted with the following warning: “System Extension Blocked”


This happens because Apple has a new policy about Kernel Extensions in macOS 10.13 High Sierra. This keeps every 3rd party Kernel Extension from running unless an Administrator user allows it. The CodeMeter driver uses such a Kernel Extension for communicating with the Hardware keys, so ARCHICAD, BIMcloud or the License Manager Tool won’t be able to communicate with them without it. Software keys don’t use this Kernel Extension, so they are unaffected by this issue.


You need to manually Allow the Kernel Extension to run (you only have to do this once on each computer).

Here’s how you can do it: during the installation process a panel will show up with instructions on how to enable the Kernel Extension:

Just press the Go to Security & Privacy Settings button and then click the Allow button next to the “WIBU-SYSTEMS AG” text:

If you forgot to do this during the installation, then here are the steps you need to make:

  1. restart your computer (the dialog to Allow the Kernel Extension only appears for half an hour, after every startup)
  2. Open the System Preferences Application
  3. Select the Security and Privacy Submenu, and go to the General tab.
  4. Click the Allow button next to the System software developer “WIBU-SYSTEM AG” was blocked from loading message.
Because of security reasons pressing the Allow button won’t take effect if you are connecting to the machine via Remote Desktop, or if the mouse/trackpad is emulated by a 3rd party application (MagicPrefs, BetterTouchTool, Synergy, etc.)
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