Applies to: Saffire Range
Starting in macOS 10.13 'High Sierra', Apple have introduced a system that will automatically prevent users from installing software that wasn't downloaded from the App Store unless the user manually allows this from System Preferences. Once the user has allowed the installation manually all other software by that developer will be allowed through automatically without having to repeat the steps.
This occurs while installing Saffire MixControl on High Sierra, if you have already installed Saffire MixControl and it is still not getting connection. I would uninstall and reinstall Saffire MixControl. Please Follow these steps.
Uninstalling Saffire MixControl.
Please remove the following:
Macintosh HD/Applications/Saffire MixControl.app
Macintosh HD/System/Library/Extensions/Saffire.kext (if present)
Macintosh HD/Library/Startup Items/Saffire/.*
Macintosh HD/Library/Application Support/Saffire/.*
Macintosh HD/Library/Audio/MIDI Drivers/SaffireMIDIDriver.plugin
Macintosh HD/Users/[yourusername]/Library/Application Support/Focusrite/.*
Macintosh HD/Library/Receipts/Install Saffire MixControl.pkg
* indicates that you should remove the entire folder
Finally, go to Finder > click 'Go' at the top of the screen > Go to folder > type /var/db/receipts > remove the following files:
Then lets reinstall the Saffire MixControl 3.7
while you are installing go to the Apple Logo in the top left> System Preferences > Security and Privacy it will ask if you want to allow this software to be installed select "Allow"