Why cant I open PDF files? There's no pop-up asking me to type in my password?

I have summer assignments that I have to download on my teacher's website. They're PDF files protected by a password.
I have the password but once I download and try to open them, there is no pop-up asking me to type in the password.
I cannot view the files without typing in the password but I cannot even get the pop-up like everyone else.
I'm opening these files on the "Preview" app.
Is there a solution to this? I tried searching for other apps in the app store that are free, but none of them work.

Try installing Adobe Acrobat Reader from the Adobe website.

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