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Did they remove that link? I can't find it anywhere.

There's a trick to making it appear. See my other comment in this discussion.

Click enroll, then look in the bottom left corner of the popup modal.

There's only the "Start Free Trial" button for me

They seem to have removed the 'audit course' option, at least on my setup. They may be doing AB testing.

If you click the Enroll button on this link you will find the Audit link: https://www.coursera.org/learn/neural-networks-deep-learning