Hello
Export from old version to new version is easy. You can see instructions at
eventbookingdoc.joomservices.com/getting...e-site-to-a-new-site
Also, please note that latest version of Events Booking requires Joomla 3.5.0+ to work, so if you plan to update to latest version of Events Booking, you will need to use Joomla 3, not Joomla 2.5 as in current version
Regards,
Tuan