You will need the free Microsoft PowerPoint Viewer 2010 on your player computers to use Presentation Player.  You will also need PowerPoint Viewer SP2 and may need the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats if you are using PowerPoint files with advanced features created in Microsoft PowerPoint 2013 or Microsoft PowerPoint 2016.

Microsoft PowerPoint Viewer 2010

Microsoft PowerPoint Viewer Service Pack 2

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats

Downloading from the Microsoft Site - Powerpoint and Excel Viewers retired in April 2018

Microsoft have recently removed the direct links for all 3 of these items from their website, as they are retiring the PowerPoint and Excel viewers.  This seems to be because they are pushing their Office 365 subscriptions and want users to purchase Office to view these file formats.  You can still download these directly for here using the above links.