The referenced link
https://fileconnect.symantec.com/ does not provide 6.5.2A English. It appears to contain only 6.5 install before patches which is needed but no patches for clients. Except maybe for Japanese or Chinese.
1) Veritas NetBackup Enterprise Server 6.5 - International English 6.5 International English
2) Veritas NetBackup Enterprise Server 6.5 - Japanese 6.5.2A Japanese
3) Veritas NetBackup Enterprise Server 6.5 - Simplified Chinese 6.5.2A Simplified Chinese
A reorganized of their web site would be useful to help to administrators.