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hey as we talked about already, the activation doesn't work because your server blocks the connection to my license key server. not sure how to solve that.
Dear @ema-studio
it looks like a plugin is causing that error:
0_1528153142192_Bildschirmfoto 2018-06-05 um 00.58.04.png
(Click on the picture to have a closer look)
Can you deactivate all plugins and see if the problem remains?