After purchasing the Pro version you will receive a welcome email. If you can't find it in your inbox, check the spam folder.
That email has the link to download the Pro version and your license code, which you will need later.
After downloading the Pro version, go to Plugins in the WordPress admin and deactivate the free version of Menu Image. Then install the Pro version using the downloaded zip file.
With the Pro version installed, press Activate.
The settings from the free version move to the Pro version. Now you only need to configure the additional Pro settings.
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