How do I download only the schedule C pages and not the whole PDF of the return?

The PDF includes all the forms and schedules that were filed for the completed federal tax return.  

You can print the Schedule C from the PDF by itself without printing the entire tax return.

To follow DoninGA's train of thought, when you view the entire PDF document in the Acrobat Reader, when you try to print and get the print dialogue box, you should be able to tell it which pages to print (usually, a page range, like 5-7).

You may not have noticed this if you haven't ever used it.

Besides, you want a copy of the full PDF file anyway - we see people here constantly wondering how they can get a copy of their return because they need something.