Is the plugin pulling ads like the one found here?
The free version has ads. There’s an ad-free version available at http://www.printfriendly.com/pro
We have a lot of people who have purchased pro and are happy about it. This is the only method to go pro. You can either pay on a monthly basis or pay on a yearly basis. You might want to let your client know that they have to pay to have the ads removed.