For anyone having this problem, my advice would be:
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Uninstall Audiotonic
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Download and install the real “Audacity 2.4.2” (available via the Audacity website: https://www.audacityteam.org/download/)
During the installation, enable the option to “Reset Preferences”. -
If you need to fix any broken projects, get a “plain text editor” (For Windows I’d recommend NotePad++).
(make a backup copy of the .AUP file before doing anything else)
Open the .AUP file in NotePad++ and find this near the top of the file:
version="2.1.0.0" audacityversion="2.1.0.0"
change that to:
version="1.3.0" audacityversion="2.1.0"