Next, the terms "PDF install" are tricky. PDFs are usually viewed, not installed. Unless the user is referring to installing software that requires a PDF, or maybe accessing a PDF file on an e-reader device which requires an install? Or perhaps they want to download the PDF and install it as a document reader? The phrasing is a bit unclear. The user might be confused about the process of obtaining and using the PDF. They might have heard of installing e-books or software that includes PDFs.