Installing SSL Certificate on Plesk 12

1. Log in to Plesk control panel.
2. "Websites & Domains" tab → select the domain.
3. "SSL/TLS Certificates" (Security section).
4. "Advanced Settings" → "Add SSL/TLS Certificate".
5. Upload/paste certificate.crt, cabundle.crt, privatekey.pem.
6. Click "Upload Certificate".

Then continue at Step 3 in the SSL Zen plugin.