Hello Ferri,
Thank you for your report. I am looking into your issue, but it seems that I might need some more information in order to properly help. Would you mind going to this page:
follow all of the instructions listed. The two main areas that need to be covered in your case are:
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The Launcher is unable to download content
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None of the Above Helped - Getting Debug Logs
Once you have all of that information zip it up using your preferred utility, attach it to a comment and we will get started investigating your issue right away.
I hope that we are able to find a suitable solution for your problem,