Admin console on OPSCenter server? Order?

So, I'm building me a new opscenter server, and it's up and running OK.  NetBackup 7.5.0.6

THEN I think to myself, I'd like a windows Admin Consosle on this box (windows server 2008, R2)

Well, you need the server install for Admin Console, so the latest one for 7.5 is 7.5.0.4 - the rest are just updates - (could be wrong)

But it won't let me install cause I have a 7.5.0.6 opscenter on..   says what I'm trying to install is older than what I have on.

Did I do this in the wrong order?