Upgrading to Truly Responsive Slides Pro from Truly Responsive Slides will enable all missing features of the commercial module. There is no loss of configuration. All instances of the free version will be transformed into instances of the full blown version.

The free module is automatically removed from the database in the process.
Nonetheless, the modules/mod_trulyresponsiveslides folder needs to be manually removed from the server directory.
Be careful The pro version is found under modules/mod_trulyresponsiveslider folder for backup compatibility with older versions. Do not delete!

Template overrides have to be re-created for the pro version, if any existed for the free version.