A family of Microsoft word processing software products for creating web, email, and print documents.
I don't know anything about this add-in, but one reason it may not work could be that you have installed the click to run version of Office 2010, which is not installed conventionally. Whether it is possible to get it to work with that version, I haven't a clue, but see http://office.microsoft.com/en-us/word-help/click-to-run-switch-to-using-an-msi-based-office-edition-HA101850538.aspx