HOW TO: Save PowerPoint Presentations from Google Docs
Before you upload PowerPoint PPT files to Google Presentations for editing, make sure you know that the opposite is not possible yet. Unlike other members of the Google Docs family, Google Presentations doesn’t have an export function so you cannot download your edited PowerPoint slideshows out of Google Presentations in PPT, PDF or any other popular formats.
Google Docs does allow you to download the presentations as a ZIP, which is a mix of HTML, CSS and JPGs, but again that’s not a very useful or convenient format. How To Save PowerPoint Presentations Out of Google Docs at Digital Inspiration - Software Reviews, Internet and Technology Guide