ShiftNav Lite and ShiftNav Pro share a common codebase, but are two independent plugins. You will only have one activated at a time.
Installing the Upgrade
When you purchase ShiftNav Pro, you’ll receive a zip file to download.
Download the zip file, then in your WordPress admin, navigate to Plugins > Add New
Then click “Upload Plugin”
Choose the ShiftNav Pro zip, and click “Install Now”
Let the installation complete, and then click “Activate Plugin”
If you have ShiftNav Lite installed, ShiftNav Pro will attempt to disable it automatically.
Check that the Lite plugin has been disabled
Double check that the ShiftNav – Responsive Mobile Menu plugin is disabled and only ShiftNav Pro – Responsive Mobile Menu is enabled. Leaving both active may cause errors.
Your settings will automatically be inherited by the ShiftNav Pro plugin. There is no need to do any settings migration when upgrading to ShiftNav Pro