...then it is probably because you don't have the Adobe Acrobat reader on your computer. You can download it for free in many places, but here is the website of Adobe.com.
...then perhaps you are using the Firefox browser. Apparently Mozilla/Firefox sometimes has great trouble or even inability to download pdf files. All of my music files are pdf files, which reproduce accurately.
Although I don't use Adobe Acrobat, the standard, to produce my documents, the Nitro PDF maker I use is compatible with Adobe Acrobat.
In Internet Explorer, when you click on one of my links to a document, a little box may pop up saying, "There is a problem with Adobe Acrobat/Reader. Please exit Adobe Acrobat/Reader and try again."
Whether you click "OK" or click the red X in the corner of the box, the document SHOULD begin downloading.
There are apparently patches or software tricks you can perform on your own computer -- not on my end -- to enable you to download documents even while using Mozilla/Firefox. Do an online search, or find a "how-to" video!
Check your printer setup box. Maybe you are trying to (accidentally) print to the wrong computer!
This is always happening to me, because I have the software programs of three different printers on my computer - my studio printer, my at-home printer, and an old printer that bit the dust a long time ago.
Frequently, a document is taking FOREVER to print, and so I have a look at my computer screen, and by golly, it is trying to send the document to a printer that is not there to receive it!