If you see the notice "GET PREMIUM SUPPORT, MORE PAYMENT GATEWAYS AND UNLOCK ADDITIONAL FEATURES" in Tickera > Settings > Payment Gateways and "CREATE UNLIMITED NUMBER OF TICKET TEMPLATES, GET PREMIUM SUPPORT AND UNLOCK ADDITIONAL FEATURES" in Tickera > Ticket Templates that means that you still have free version activated.
In this case you have to deactivate free version of Tickera named "Tickera" and activate premium version named "Tickera (Premium)" downloaded from your account - https://tickera.com/members/
All the Settings, Events, Orders, etc. you have set in Free version will be saved and will appear when you activate premium version of the plugin.