Free to Pro upgrade issue.
I installed the free version first and then purchased the pro 1-site license. I don't see any way to upgrade the free version with a license key. Do I need to remove it from my wordpress installation and upload the pro plugin manually?
Go to your MP Manage Ninja dashboard and download the Pro add-on. Install in WP and activate with your license key (also found in the dashboard). Do not remove the free version.