Unable to view previously viewable pdf

[Arax424]

I'm not very tech savvy, so bear with me... Approximately one and a half years ago, important documents were sent to me as attachments. I just noticed that the sender, in another email, directed me to use a certain login credentials in order to view the docs. I don't recall the login field. It is now very important that I print those documents again, but I assume they won't, because when I click to view, a message states, "We are having trouble viewing this file." It also asks me to download the file. I have done that, but these files won't open. Further, I see no place to enter login cred

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