I'm not sure that I understand how you are using the word "download". I can open that link in a web browser and scroll down through the complete user manual list without any problem or errors. Is that what you mean by download? What specific error message did you get?
Sorry, I should have clarified - I could not download the PDF file. {I am somewhat "old school" & like to have some things in hard copy.}
It was LATE when I posted, & I was tired. Inaddition to being old school, I am also OLD...《grin》