Hello
1. First of all, make sure you configured Download ID for your Events Booking installation. See
eventbookingdoc.joomservices.com/getting...on#use-joomla-update
2. Go to Extensions -> Plugins, check and make sure the plugin Installer - Membership Pro is enabled. If not, enable it
3. Maybe it also happens because you are using a Download ID which was used on a different website (could be the dev version of the site). In this case, generate and use new Download ID
If you still cannot get it sorted yourself, please submit a support ticket so that we can check to see what's wrong and guide you to correct it
Regards,
Tuan
