See below for how to download a client certificate.
To download a client certificate
Log in to the Cryptographic Security Platform Vault for Cryptographic APIs webGUI.
From the Home tab, select Security > Client Certificates.
On the Manage Client Certificates page, select the client certificate that you want to download.
Click the Client Certificate tab.
Click Download.
Wait while Vault for Cryptographic APIs webGUI downloads a ZIP bundle that contains the client certificate and the CA certificate.