Purchase a licence key for LayerSlider and Slider Revolution

Hello , I bought BeTheme at you and and Layer Slider
Slider Revolution I have the following error message.

 You need to authorize this site in order to get upgrades or support for this plugin. Purchase a license or enter an existing purchase code.


Activate Slider Revolution for Premium Benefits. You can Enter an existing licence key or Purchase a licence key.

How do I resolve this error


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