Hi,
I am trying to print a copy of an invoice I created on QuickBooks and this screen popped up. 

It won’t let me print.  What should I do? 



In this case, the Operating system has flagged this add on software as harmful. It's possible they are being overly cautious but there's no way of knowing what exactly this installation would be doing without further investigation. I would trust that Apple is correct in this case and not attempt to install it. This should not prevent you from printing something. There is probably another reason you would be unable to print from within Quickbooks. Quickbooks shouldn't be relying on this software in order to print.