Confirmation dialog should consist of a simple confirmation question and 2 or more selectable responses. So I would change it to be a short question instead of what it now is.
And since the download confirmation is a response to an action that the user has done (by clicking download), the user should know what he/she is doing, so keeping the question simple you make sure it's easy to answer as well.
The way JohnGB already put it was my first thought as well, so not providing any other suggestions of the wordings, just that confirmation dialog should be a simple question with clear answers.
Note: If the "approve" response is critical (like it costs something when you click on it), it shouldn't be the default response for the confirmation, so you don't accidentally approve to pay.