Downloaded the hotfix lightly compressed version and ran the Mac app. It failed to launch again. Digging through it, I ran into the same issue as before - the controlling shell script has dos line endings. As explained
here, change the line endings to unix. The app was also quarantined. You can see this in Terminal by running
xattr -lr EcchiSensei.app
I got a bunch of lines that mentioned com.apple.quarantine.
To fix it, run
xattr -dr com.apple.quarantine EcchiSensei.app
Latecomer someone should investigate why the shell script (EcchiSensei.app/Contents/MacOS/EcchiSensei) has dos line endings.