No installation is required for NDMP.
This may be true for Windows installations, but for a UNIX installation you WILL need to install NDMP from the "Add-ons & Database Agents" (aka UOptions) media.
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NetBackup Add-On Product Installation
Choose the Add-On Products you wish to install
one at a time or select Install All Add-On Products.
1) NetBackup Encryption
2) NetBackup LiveUpdate Agent
3) NetBackup for NDMP
4) NetBackup Snapshot Client
5) NetBackup Vault
6) Install All Add-On Products
q) Done Selecting Products
x) Exit from this Script
Choose an option: 3
You'll also want to install any "DMP" maintenance packs or release updates to bring the NDMP piece up to the same rev as the rest of your NetBackup installation.