Need set up instructions for recording audio from macOS 15.1

How to record desktop audio from MacBook Pro macOS 15.1 (Sequoia) to Audacity 3.7.0?
I replaced my old computer with a newer one and can no longer record. Previously, I installed !ShowU Audio Capture and included it in my Multi-Output Device but it is no longer recognized by Audacity. I would like to delete the Multi-Output Device and start from scratch.

You need “BlackHole” from “Existential Audio” to record.

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