Can not download pdf file of lessons

hello,
I am studying module 4, from the advanced DNS section until the end of the module, I could not download the provided pdf files related to each section. i have received this message


would you please help me how can I solve the problem

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Greetings,
So you are unbale to download the PDF’s in the Advanced DNS topics section, is that correct? Have you been able to download the PDF’s in any of the other sections?

Robert

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Hello,
thank you for your reply, the problem is solved.

Great! Thanks for reporting this.