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BUG I bought a license Key but I can't ad an instagram account

I just bought an annual license key for my two websites (pro) to put two different instagram account in each website and I have this message : "Public License is a GPLv2 compatible license allowing you to change and use this version of the plugin for free. Please keep in mind this license covers only free edition of the plugin. Premium versions are distributed with other type of a license."
I don't understand why to buy a license key if it's the same that the free one.

thank you!