There are usually 2 problems that lead you to looking for a 64bit version of Office:
I downloaded the free trial of Office 2010, but it seems to be 32bit only.
There is no other download link on the web site, but I'm sure there is a 64bit version as well and I want to use it. How do I get it?
Alternatively, you might be facing issues with installing your trial of Microsoft Office 2010 when having 32bit Office application already installed. You might be presented with an error such as: