Very disappointed that Catalina does not support Audacity anymore

This is from the Audacity website and includes a possible workaround. Open Terminal (not Finder.app as on website) and run it thru Terminal, check yes to use Mic, then the Line In recording in Audacity will work (at least on my machine).

MacOS 10.15 (Catalina) does not support Audacity 2.3.2

Posted on October 10, 2019 by Steve Daulton

MacOS 10.15 (Catalina) introduces additional restrictions on running non-Apple software. These restrictions prevent Audacity from functioning correctly, and may conflict with Audacity’s open source license (yet to be confirmed).

If you are currently using Audacity on an older version of macOS and wish to continue using Audacity, we recommend that you don’t update to Catalina yet.

Although Catalina is not officially supported, there’s a workaround that has been reported to work for some (but not all) user with Catalina and Audacity 2.3.2:

1. Go to Applications > Utilities
2. Launch Terminal.app
3. in the Terminal dialog type the following command following command: 

open /Applications/Audacity.app/Contents/MacOS/Audacity

1. (this assume that Audacity is stored in your Applications folder. If it is somewhere else, you will need to change the path in the above command.) 
2. Confirm the request for microphone permissions when requested.

For additional information about this workaround, see this post on the Audacity forum: https://forum.audacityteam.org/viewtopic.php?f=47&t=107162&p=378694

This advice will be updated when more information becomes available.

If you upgrade Audacity to the latest release which is 2.3.2, it will run on Catalina, since it is now 64 bit with that version.

I am using Audacity 2.3.1 with Catalina with no issues. What version do you have?

Be thankful that they are more interested in updating their code rather than their webpage.

What are you recording (source)?

In System Preferences->Security & Privacy, you may need to manually

add Full Disk Access and/or Files and Folders.