I download from Audacity ® | Download for Linux
I just tried again (audacity-linux-3.7.1-x64-20.04.AppImage), with same result. (The file is identical.)
And I just tried downloading it with Chromium (instead of Firefox). Same result.
The older versions were downloaded when they were the current version.
I just found a workaround for the missing horizontal scroll bar in audacity-linux-3.5.1-x64.AppImage - Missing horizontal scroll bar - so I don’t NEED a newer version. 