Manually Approve the System Extension and Network Filtering

If the System Extension is not pre-approved by MDM (recommended), you can manually approve System Extensions locally after you upgrade the OS.

Procedure

1. On an endpoint running macOS 11 Big Sur, install the sensor on the endpoint and then go to the General tab in the Security & Privacy pane in System Preferences.
2. Authenticate as an administrator. Click the Allow button next to the System software from application es-loader was blocked from loading message.
3. Click the Allow button in the es-loader Would Like to Filter Network Content window.

Results

The installer will finish running and load.