Problems with Download-Per-Paypal Installation

Downloaded the latest version. Uploaded to the wp-contents file. Activated it. Filled out the Admin sheet. Put the [downloadPerPaypal] on the page where I am selling my ebook. Nothing shows up on the page to click on to sell the book. Also disappointed in that the instructions are vague. Doesn’t tell you how to go and edit your book or whether or how to “sell” more than one book. Say you have 5 does each one have to have a separate page? No place for paypal to return to unless it is this page. On the paypal side, I have IPN enabled but needs a return page but this plug-in explains very little on the paypal side. Nice that I know enough about plugs ins and this is the third one I’ve tried. Tried the Demon Product Download Demon… at least it would go to paypal after I played around with it for 4 hrs. but wouldn’t return to the correct page. Too bad.