Choose 32-bit or 64-bit Edition of Microsoft Office 2010/2013/2016 (includes Office 365)
About 64-bit of Office 2010/2013/2016 (includes Office 365)
Current editions of Classic Menu for Office 2010 and 2013 Suites (for Enterprise, Professional Plus, Professional, Home and Business) work fine with 32-bit and 64-bit editions of Office 2010 and 2013, 32-bit and 64-bit of Windows.
Which is suit for you, 32-bit or 64-bit?
There are few software and add-ins designed for 64-bit versions of Office 2010/2013. Microsoft recommends most users to install 32-bit version of Office 2010/2013/2016 but not 64-bit version at following pages:
"This product includes both 32- and 64-bit versions for a single computer. We recommend the 32-bit version, which runs great on both 32- and 64-bit versions of Windows. People who routinely use very large documents or spreadsheets that need more than 2 GB of memory may want to run the 64-bit version, but many common add-ins for Office don't run correctly in the 64-bit edition."
We recommend you to install the 32-bit edition of Office 2010/2013/2016 if you don't need to operate single document which larger than 500MB.