Downgrading from Mac Office Business to Mac Office Personal

I am a registered user of Mac Office Personal. I recently want to try out Mac Outlook. When attempting to load Outlook I was told I had to upgrade to do that. I opted for the trial upgrade to see if I liked it. I don't. Now I'd like to revert back to my fully licensed version of Mac Office Personal. What is the easiest way to do that?

Do I need to first completely uninstall Office Business and then reinstall Office Personal? That's okay. I just want to make sure that won't count as a second install. I have the Family Pack that includes three installs.