Download a root CA certificate
To download a root CA certificate in DigiCert® Private CA:
In the left main menu, under Manage CAs , select Roots.
On the Root Certificate Authorities page, find the certificate you want to download.
Point at the certificate name and select More actions (the three dots).
Select the download option you prefer:
Download the certificate as a .pem file.
Download the certificate as a .cer file.
Save the downloaded certificate file.