Using catalog backup and recovery to transfer NetBackup catalogs between master servers as part of a hardware refresh

I want to use catalog backup and recovery to transfer NetBackup catalogs between Red Hat Linux master servers as part of a hardware refresh per this tech doc: http://www.symantec.com/docs/TECH77448.  What I'm trying to find out is can I find a full NBU 6.5.6 installation to download and install on the new hardware, similar to what was mentioned in this forum discussion: https://www-secure.symantec.com/connect/forums/netbackup-656-75-new-hardware#comment-8242661.  This is ultimately part of upgrading, eventually to 7.5 on the new hardware.  It would seem that this path would provide a safe method of accomplishing the upgrade (both OS & NBU version) without risking the current installation.

Thanks for any help,

Roger