Error message from web - when opening pdf files

Hi,
I receive the following error message a lot when I try to open an educational pdf file from the web.  What do I need to do to 1. see, 2. print and 3. save these type of educational pdf files from the web?  I am using a MacBookPro OS X.
Thanks for your help and sorry I could not find an answer on the forum. 
Example:  I try to import or download MIT18_06SCF11_Ses3.5sum 2.pdf onto my desktop - which seems successful.  However when I try to open this file, I get the following error message.:
"Adobe Reader could not open 'MIT18_06SCF11_Ses3.5sum 2.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded)."

Yes i tried following your list of commands and got the same error from MyMathLab by Pearson Publishing or the other link.  I'm beginning to wonder if they are protected. 
As you probably guess - I am not computer savvy.  I will take my laptop to school tomorrow and ask another student. 
Thanks for your followup.

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