Here is the latest version of the DigiCert User Guide v9.5.
https://www.digicert.com/certcentral-support/digicert-user-guide.pdf
Version 9.5 Changes:
CertCentral (GÉANT) Change Log Summary - https://www.digicert.com/certcentral-support/geant-change-log-summary.htm
Enhancements made to client certificates. When ordering a client certificate (Premium, Email Security Plus, Digital Plus, and Authentication Plus), you may now include a Custom Expiration Date for your client certificates.
Previously when ordering a client certificate, you were only able to select 1, 2, or 3 years for the certificate's validity period.
Updated Instructions in DigiCert User Guide version 9.5
- 11.1.5 How to Request a Client Certificate
- 11.12.32 How to Renew a Client Certificate