I know it sounds obvious, but did you try deleting the files and re-downloading? Also, where did you download them to a computer or a mobile device like a phone? Because I have found sometimes when I download to my phone, PDFs could be blank when I open them in the file section of my phone, but if I open it in an application like Adobe PDF I can see them fine.
Apocalypse Nerd
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A member registered Jan 19, 2018 · View creator page →