Insert serial option is not in the volume edition. Download that (32 bit is around 3.25 gb and 64 bit is 3.7-3.8 gb) from here or from other sources and install. No problems and no key requirement during install. You will get initial 30 days grace which can be extended, and later activated for 180 days.
The referred to edition is a volume edition and should not require a key for install based on my personal experience.
After the 180 days are up it will be 2012 o $#!# lol... What will happen is that office 2010 will go into notifications mode... Whats best is to set up a task in the task scheduler that runs every 170 days so you won't have to worry about this kinda thing...
I downloaded Microsoft.Office.2010.x86.OPK-CRBS , it installed starter but for setup.exe in office its asking for Product Key, which i could not locate. Any help ?