The documentation you linked is related to DLP rather than an encryption product.
I assume you're speaking about upgrading the Symantec Encryption Management Server (SEMS). If you're looking to update to a minor revision, you can use the PUP update files that should be available in your Broadcom products page.
If you are jumping a major version (from 3.3.x
, or from 3.4.x
), you would need to capture a backup of your existing Database
and Organization Key
and get the files off the server via SSH/SCP, install the new version you wish to have, then restore the backup to it.
More information about this is in the SEMS Upgrade Guide