The “Create Booklet” PDF action stopped working when Mojave was released. It seems to be to do with Apple requiring an increased level of application signing. What this means is that the old version of Create Booklet (that was free) that I wrote about here no longer works. You need to download the new version from the Apple App Store. (It costs $20). I’m not sure if it’s worth $20 just to be able to make a booklet. It may be worth it to you. In my opinion it should be a feature that the built in OSX print driver can do. But for now I cannot find any free options to do this.
Everything below here is now obsolete but I have kept it here as a reference.
The Create Booklet PDF action stopped working when Mojave was released, but it’s not broken! It’s part of the set of ‘security’ features that Apple introduced in Mojave. Here’s how to get it going again.
All you have to do to get Create Booklet working again is open the ‘Automator’ App and under the ‘Automator’ menu and click ‘Third Party Automator Actions’ and then enable them.

The way I found this was to Open the OSX ‘Console’ application and then I tried to print using Create Booklet. The following message came up in Console:
Error executing PDF Workflow /Library/PDF Services/Create Booklet.workflow: The operation couldn’t be completed. This workflow contains the action “Create Bookletâ€, which is provided by a third party. Third party actions must be explicitly enabled To enable third party actions, open Automator and choose Third Party Actions from the Automator menu.
It’s rather rude from Apple that they hide this error message away in a console with no hint of what’s happening! But thankfully there’s an easy fix.
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