SSH into your ISE node or check the Admin Portal (Menu > Administration > System > About). Note the full version, e.g., 3.1.0.518 . The patch you download must match the major.minor version.
Open your browser and go to: Log in with your corporate CCO ID that has entitlements linked to your ISE Smart Account. cisco ise download patch
For most modern versions (ISE 3.x), the "Prepare" feature is part of the upgrade or maintenance workflow: SSH into your ISE node or check the