Upgrading to Appointments Plus from Lite

Hello. I had Appointments Lite installed and running on the site.

I've purchased appointments plus. What is the best process for going about upgrading without losing my existing appointments.

I installed the WPMU Dev dashboard and it already says that Appointments Plus is installed, but when I go to my plugins list I only see Appointments Lite, and when I go to the settings for Appointments it's only the Lite version.

Thanks.