That is extremely old / obsolete, and in my experience it’s not very stable on modern Macs.
There’s a much newer version called “iShowU Audio Capture”
(Note this is not our product and we don’t provide technical support for other people’s software, but here’s the link: https://support.shinywhitebox.com/hc/en-us/articles/204161459-Installing-iShowU-Audio-Capture)
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