I think our PDF software, PDF Studio, is pretty good. But maybe your question relates to free PDF readers? We have a free PDF reader called PDF Studio Viewer which can be used to view & annotate PDF documents. For editing documents, you will need PDF Studio Pro which is commercial. Disclaimer. I am a founder and developer at Qoppa Software.
If there is only one, select it. A popup window will appear and give you three choices. The last one is a good one! Click Install and the PDF reader will be installed automatically. The link is already there in your browser. Go to your Downloads page and click on your downloaded file. You should find yourself at your Downloads folder now. You can read all your PDFs there. Furthermore, you even have the option of setting your password. The previewer is very helpful if you want to read your own old works. You can open and extract PDFs and open them directly. The PDF reader will never show you unsaved changes! But as you can learn with Chrome or Firefox, you can still navigate to any page and edit.