Wondering, just to cut down on plugins, can I delete the free version of the plugin once I have uploaded the pro version, and I have received a message that my license key works and it is up and running?
Please leave your free version as well. To make it work you need to have both versions activated (free and pro). Free version contains all base features, whereas pro version has only additional (pro) features. So pro version can’t work without free. Please try it, and if you’ll have any problems with activation you can simply provide me the access to your WordPress admin area and I will set it up for you.
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