Betheme Installation on Wordpress 4.8

Hi there,
the installation of my purchased betheme is not working on Wordpress 4.8. After uploading the ZIP-File, wordpress shows the following message and aborts.

"Bist du sicher, dass du das tun möchtest?

Bitte versuche es noch einmal."

Translation:
Are you sure you want to do this? Please try again.

Can you help me on this please?

Thanks and regards

Marc
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