Thanks for the replies, @harlan4096. I just did an uninstall and new download of Total Security from the My Kaspersky website downloads page. It did a complete install with computer reboot. Still shows 21.3.10.391 (j) as the Application Version.
I'm having difficulty running the Open Tip scanner suggested on the page for taking actions on suspected false positives. Kaspersky deleted the application file that had been flagged as malicious, so I can't upload it to the site. I guess I'll just go ahead and submit a report anyway.
The Izotope installation process uses an exe on Windows to download, copy, and install the application files, so I can't just grab the underlying flagged application file. If you want to try running the installation for yourself, I uploaded the installation executable to pCloud (a file sharing service). You should be able to download it from this link:
https : //u.pcloud.link/publink/show?code=XZpJeu0Z3xCdvRlNpk0pTkutUj9NbkmqI0rV
I'll continue through the contact channel. Thanks again.