You can find ALL the release updates here:
This article contains information about upgrade requirements and the entire listing for all NetBack...
But you state you only want to go to 6.5.3.1, so from the above document you'll need to go to
both the following:
List of links to the NetBackup Enterprise Server 6.5.3 Release Update downloads ...
List of links to the NetBackup Enterprise Server 6.5.3 Hotfix 1 (6.5.3.1) downloads ...
From the install guide:
"...
Sequence for installing or upgrading
Each procedure in this chapter is an independent process that you can use to perform the type of installation best suited to your environment. Each procedure includes the differences between a new installation and an upgrade.
When you install or upgrade NetBackup server software, Symantec recommends the following sequence:
1 Master servers
2 Media servers, if any (NetBackup Enterprise Server only)
3 NetBackup Remote Administration Console, if any
4 NetBackup clients
5 Any NetBackup add-on products
..."
All the manuals can be found here:
Listing of Veritas NetBackup (tm) 6.5 and 6.5.x Manuals and links to the respective TechNotes ...
Please be aware though that at the time of posting Symantecs ftp server appears to be "playing up" again, so unfortunately it may not be possible to download any of the above!