Re-Entering License Key for Acrobat Pro

We received Adobe Acrobat Professional login, password and license key in an email from TechSoup. The download from the Adobe website and installation went fine, but when I open the program it says the license key is incorrect and closes. When I re-install the program, there is no option to re-enter the license key.
How do I re-enter the license key? I really hope I don’t have to download the whole program again, since it took three hours last time…

http://www.techsoup.org/fb/index.cfm?fuseaction=forums.showSingleTopic&forum=2009&id=67229&cid=117