Sorry -- didn't notice the date -- was searching (frantically) to find a way to take a rolling screen shot of a document (not a web page). My apologies again for not noticing the date.
Exactly what is your goal?
Post #2 suggests printing to PDF. This still works. In fact, it works better now than it did in 2009.
Printing to PDF is done using the "PDF" button that appears at lower left in the Print dialog (File menu, Print menu-item). Click the PDF button, and it presents a drop-down menu of actions. One is "Save to PDF". Choose that, and proceed with saving to a specific folder, with a chosen name.
If printing to PDF is an inadequate solution, then please explain exactly what you need, and from what application.
Also, did you check the Mac App Store to see what's available? If so, what did you find, and why wasn't it suitable?