Hi,
Thanks for purchasing Pro. I can help you out here.
You are correct Pro does not show in the plugin search as it is not on WordPress.org only The Events Calendar is there.
When you purchased Pro you should have a receipt email that has download links that you can use to download the zip file of the plugin to your computer.
Then on your site go to:
Plugins > Add New
Click Upload Plugin on the top left of the screen.
Then find the file you downloaded for Pro, Upload it and activate.
Site Download
You can also login to your account and go to:
Account Central > Downloads
And get the latest version there as well.
Let me know if you run into any issues.
Thanks