Can not upload be theme for second webside

Hi, 

I purchased a second version of the BE theme to use it on a second website. However if I download the two versions on themeforest the files look exactly the same. When I try to upload it, wordpress says: are you sure you want to do this? - I think it does not register the second Key. Can you please help me install the theme. 

Thank you 
Best 
Nik 
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