Plugin to provide presentations for a fee

My neighbor is a retired teacher. He wants a WordPress site where he can host presentations on how to be a effective teacher, resolving teaching challenges etc. He has around 50 such PowerPoint presentations. He wants to make them available for new teachers for a price. He knows that new teachers need to be given some material for free so that they are willing to pay for more content. He plans to give 2 presentations for free after the user provides his email and getting his IP address, then if the user wants more, he can buy the other presentations.

Is there any WordPress plugin which can do that?

Thanks