revolution slider purchase code not valid … i know

Hello,
i've installed WP 4.4.2 on a webserver, then uploaded the betheme.zip (no child meanwhile), installed and activated only the necessary plugins through the provided plugin installer from betheme and then tried to activate the rev slider but its only said "purchase code is not valid". I've checked the spelling and the accuracy of the code, but nothing. I only installed that code before on a local Installation, but this is deleted meanwhile. 
So, can somebody give me a hint or help me out?

For a supporter i also can give an admin access.

Thanks Markus

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