Customer was following the instructions as per
Download the Digicert CA Certificate
The Digicert Certificate Authority (CA) certificate is used for CA SMP/E Internet Service Retrieval.
Follow these steps:
Go to the following website to download the Digicert CA certificate
Note the location of the file on your workstation where the certificate was downloaded
Clicking on the link above, resulted in the following
Firefox
Possible incompatibility with Firefox