Net Backup - 6.5 Client Package

Hello All,

I got a request to backup of Windows 2000 machines - Currently am running Netbackup Master Server version is 7.5.

So I though if we install Netbackup client package 6.5 on 2000 machine, we can configure the backups. But couldn't get the client package for 6.5 version. 

Can some one please help me to get the Client package for 6.5 Version for windows client.

And please let me know if we have any other alternate to configure backup for Windows 2000 machine.

Many thanks in advance