Simplest way is to save the PPT file as a series of JPG files (an option in the Save As dialog) and click through the slides like you would if they were actual physical slides

If you have video or animations the other option is to use a conversion software to save the entire presentation as a video that you can pause at any given time. This should be easily done with the AAXA M1 since it has a remote control unlike many of the other pocket projectors.