Blocked by Content Security Policy

I am having an issue on my site acuitypro.com with my downloads. They are coming from Dropbox and are password protected. However, after the user enters the correct password and gets the green download button, if they do not click it quickly the page reloads to a content security policy error. This is happening in both Firefox and Chrome.

I have been working with WP Engine to try and resolve this issue but they are telling me that the downloads should come from dl.dropbox.com and not from dropbox.com to avoid loading the download in a frame.

Can someone point me in the right direction for how to get the Dropbox add-on to download from the correct URL to avoid this? Or another way to resolve this?

Any update here? Its been almost a week and my downloads are not working properly.