You don't need to subscribe. Just follow the link provided, select full screen view by clicking on the icon in bottom right corner. This exposes a download arrow in the top left corner. Click it and in a few seconds you'll have a PDF document that you can save wherever you like.
While the feature has a change of name it works exactly as before. If you want a number of programs to simultaneously use the same driver as Sonar then don't tick the box. If you want to select which individual program gets to make a sound then check the box as this will allow the program with Windows focus o have exclusive access to the driver.
BTW as I said I was having a bit of a rant. You don't owe me an explanation.