2.4.1 Will not run on MacOS 10.15

Please reset the Audacity settings as explained here: https://forum.audacityteam.org/t/resetting-audacity/50613/1

If that does not help, check the following.
Did you download Audacity from this site: https://www.audacityteam.org/download/mac/ ?
Please check the SHA checksum according to these instructions:
https://www.audacityteam.org/download/online-safety-when-downloading/#validate

– Bill