Hi, ompointyoga. Great question! 🙂
Normally, assuming your license key is listed in the Events Calendar settings, the plugins should automatically find updates for themselves. If ever they don’t, you can always find the latest versions on your Account’s Download page.
When installing the plugin, please be sure to back up your site first. You’ll also need to rename or delete the existing plugin file(s) because WordPress will not overwrite them for you.
Please let us know if you encounter any snags along the way!