Driver alert keeps showing up

Usually, the following driver alert will appear on first start-up and the alert will disappear after you allow the system software from System Preferences.

Unfortunately, the allow button may sometimes not appear in System Preferences due to a problem with macOS driver loading.
In this case, you can display the allow button by deactivating and activating driver as described in the Advanced section on the alert.

dext-alert@2x.png

macOS Catalina Notes

Karabiner-Elements requires macOS 10.15.6 or later, because macOS 10.15.5 or earlier has an issue around DriverKit.

Please use Karabiner-Elements 12.10.0 if you are using macOS 10.15.5 or earlier.