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Thank you for the advice, unfortunately neither solution worked.

I should have mentioned that the software itself is Apogee Maestro 2, the hardware is the Apogee Duet.

Not sure if that helps in any way.

Thanks for the reply

I was able to install the latest Firmware without any trouble, and had to do so more times than I care to remember due to the uninstall/reinstall requirements.

Apogee are somewhat at a loss as to the issue but I know I am not alone in having the problem.

I'm not sure I am competent enough to be rummaging around the Terminal.

Thanks for the link, I have NEVER been able to bring up the 'ALLOW' button on Security and Privacy, that sis the crux of the issue.

As previously mentioned I have started/re-started and installed/ uninstalled so many times I could do it in my sleep.

As mentioned, Apogee are also at a loss.

I have found a fix for which I take no credit, it was on the Web and here is the link:

How to fix Apogee Duet Firewire + macOS High Sierra - YouTube

And here is the fix written down:

1. Start up in recovery mode - Hold down Command R

2. Type ‘csrutil disable’ and press return, restart the computer

3. Install the Maestro driver again, restart

4. Check to see if the Maestro is working

I would like to place on record my sincere thanks for all your help and effort on my behalf

Regards

Mark

Just for an update on my issue:

I came across this:

I have found a fix for which I take no credit, it was on the Web and here is the link:

How to fix Apogee Duet Firewire + macOS High Sierra - YouTube

And here is the fix written down:

1. Start up in recovery mode - Hold down Command R

2. Type ‘csrutil disable’ and press return, restart the computer

3. Install the Maestro driver again, restart

4. Check to see if the Maestro is working

and it worked

However, when I let Apogee know, this was their response:

GregC (Apogee Electronics)

Nov 5, 5:35 PM PST

Hi Mark! Thank you for reaching out.

This was such a thrilling news to us that we forwarded this solution to one of our engineer to figure out what this pseudo command actually does.

This is basically a protective measure that Apple has put so that the Mac is less vulnerable to destructive commands that end-users can do.

By disabling this measure, you may be able to get Maestro2 to recognize Duet, but it is also left undeniably vulnerable to other things..

Best regards,

Greg C.

Apogee Tech Support"

Mark