When your internet connection is not working, then you should not need to panic. Also, you should get in touch with the support executives via Att Customer Service 1-833-891-2999. The support team will let you know you should keep your router away from the electronic devices. Also, you have to turn off your router when you do not use the internet connection, etc. https://emailcontacthelp.com/att-customer-service-phone-number.html
Instructions to download pdf
Go to the 'Project PDF' section. There should be a link (in blue) something like Book_Name.pdf.
You can just click on it, or you can "download" it. There is a big difference.
If you click, the PDF will probably open inside your browser window
To download, right-click (Ctrl click on a mac) on the PDF link and choose "Save as . . ." from the list of options. Navigate to the location where you want to store the file and save it there. Open the PDF from your storage location.