It is a dedicated free batch document converter ... Here are the main steps to batch convert PPT or PPTX to PDF using AVS Document Converter: Simply download and install AVS Document Converter ...

Now, select the PPT and PPTX files that you need to convert ... batch file conversion and has some limitations. To download its free version and know more about it, navigate to filestar.com.

and iMovie free to download from the App Store. With Keynote installed you just locate the .pptx file in Finder. Right click on it, then move the cursor onto Open with… and select Keynote.