Hi,
Sorry for the trouble. That's a silly mistake that we have made. We forgot to put the blank index.html file inside the ZIP, which was causing 404/not found error.
I just patched this error.
Couple minutes ago, i hve re-sent you the download link to your email address. Click the link and re-download the Zoom Effect extensions from our server. This time you will get the patched version and try again.
It might still shows an error message of (invalid token) during the installation, but the plugin will be successfully installed.
Regards,
Support