After install I get this message:

Warning: Unresponsive script
A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: file:///Applications/Zimbra%20Desktop/macos/prism/

After I press continue:
I get this message:

JavaScript Application
Couldn't access Zimbra Desktop server. If issue persists after reinstall, please check logs for errors and report to Zimbra Desktop.

Zimbra in a browser (Safari) works fine.

Already tried to repair disk permissions. No luck yet.

/Users/USER/Library/Zimbra Desktop/log

is empty!