First please check in plugins if the pro version of the plugin is activated.
If you not see pro version of the plugin in plugins use this steps:
1. Login to your account on freemius.com
2. download the pro version of the plugin
3. Diactivate free version
4. Upload pro version
5. Activate pro version
Why freemius.com?
Because we are using it for version control and payments so when you buy something then you will have an account in freemius.com