a) Don't know. Anyone else?
b) I think you need the v6.5 Upgrade Portal here:
http://seer.entsupport.symantec.com/docs/290185.htm
c) Is just a list of what the master believes are the software versions of clients. It doesn't actaulyl contain any software. The next time NetBackup talks to a client, it'll update the list. I suspect that one is asked to delete it because it causes issues with upgrades - but I can't confirm.
d) You can't - ordinarily.
"bpconfig -tries 0" has been deprecated in v6.5 - there is no equivalent.
You have three options:
d1) De-activate all policies beforehand.
d2) Write a script to manually massage the text file"/usr/openv/netbackup/db/config/sync" to change "TRIES_PER_PERIOD n" to "TRIES_PER_PERIOD 0" and then also update the MD5 checksum at the end of the file - BTW, I don't know how to regenerate the MD5 checksum. Does anyone?
d3) Keep issuing "nbpemreq -suspend_scheduling" repeatedly and quickly as NetBackup starts, and hope you get your command in before nbpem begins queueing off jobs.