You may find a copy of it at Nortel, but you need to be on site for the upgrade anyway and as soon as you access the BCM, unified manager is the first menu choice. It's a gui interface instead of an independent interface like elements manager.
It is java driven and if you have problems, you may need to degrade to java runtime 1.5, though I wouldn't unless you have menu trouble.
You will only need the unified manager to change the ee_admin password back to system default...after that, the upgrade CDs do the rest.
NCSS NCTS NCTE