To download Oracle Audit Vault and Database Firewall, go to the Software Delivery Cloud, select 'Oracle Database' from the 'Product Pack' drop-down menu, and choose 'Linux x86-64' as your platform, then click on the 'Go' button.

Select "Oracle Audit Vault and Database Firewall 12.1.1 Media Pack", Part Number B73420-01.

Once you download the file(s) needed, you can either burn the ISO file(s) into DVD(s) or  install from the ISO file using a server management tool such  as iLo or iLOM.