Bellows Lite and Bellows Pro share a commmon codebase, but are two independent plugins. You will only have one activated at a time.
Installing the Upgrade
When you purchase Bellows Pro, you’ll receive a zip file to download. Follow the Installation Instructions to install the Bellows Pro plugin.
If you currently have Bellows Lite active, the Bellows Pro installation process will attempt to disable Bellows Lite.
Check that the Lite plugin has been disabled
Double check that the Bellows Accordion Menu plugin is disabled and only Bellows Pro – Accordion Menu is enabled. Leaving both active may cause errors.
Your settings will automatically be inherited by the Bellows Pro plugin. There is no need to do any settings migration when upgrading to ShiftNav Pro