Das Plugin kann nicht aktiviert werden, da es einen fatalen Fehler erzeugt.

Hi,

Thanks for contacting us here about this extension.

WP 5.5.1
Version 4.8.2
Warning: Attempt to assign property 'level' of non-object in -------------------------/plugins/wp-file-download/app/site/models/categoriesfront.php on line 296

In order to have a deeper look at your problem, please drop us a ticket (menu Support > Support ticket).
Our developer in charge will take a look at that.

P.S: Please write in English in the next replies!

Kind Regards,