The ReadCube Web Reader is now available directly from 100+ Wiley Online Library journals and Cochrane Database of Systematic Reviews. So long as you have access to an article (either from a personal subscription, proxy, or through a university login), you can navigate directly to the ReadCube Web Reader from an article page, search page or table of contents page using any of the 'PDF' options. After navigating to the Enhanced PDF in the ReadCube Papers Web Reader, you will notice a ReadCube Papers Toolbar along the top of the screen. Choose the "Download PDF" option on the right hand side to immediately download the article to your computer.
Next to the 'Download PDF' button there is the Add to Library button, which allows you to add an article to your ReadCube Papers library.