When you click "Read Now", it will take you to a PDF where you can read the book. On the top of the screen, there should be a menu of symbols and buttons. It should look like this:
On the top right corner, there is a symbol with an arrow mark facing downwards. It looks like the image below.
Once you have pressed this button, the file will automatically start to download on it's own self. Once it is done the file will show up in your download history (press Ctrl+J). The permission to free use of this book (meaning you can give copies of it and other uses) is granted.Â