Hi Reinhard,
Sorry about that - some debugging output is preventing the activation. I have now fixed your site (the one you sent login details for) so that UpdraftPlus does not make that output. Or was it a different site? If it was a different site, then deactivate/deinstall UpdraftPlus and then re-install.
You can also in future turn off debugging in WordPress/UpdraftPlus, to prevent those messages.
David
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