Hey Jeannie,
Thank you for purchasing a license for Events Aggregator! What you’ll need to do is visit wordpress.org/plugins/the-events-calendar/ and download the latest version there (currently 4.3.0.1) and install/activate it on your WordPress website. Once that’s done, visit Events > Settings > Licenses and input the license key for Events Aggregator in the appropriate field. Make sure and hit the ‘Save Changes‘ button at the bottom of the page to ensure the license key is saved.
Please let me know if you have any more questions and if you haven’t already, I encourage you to read the New User Primer as it’s filled with tons of helpful knowledge.
Take care and thanks again for choosing Events Aggregator. Cheers!