Issues launching Flashplayer installer file in Windows 8.1

I am running Windows 8.1 and attempted to download Flashplayer for Firefox.  The Flashplayer installer will not launch.  I only get a gray box, with no action happening.

I have Flashplayer working in IE, but it will not launch for Firefox.  Any ideas on what might be blocking the Flashplayer installer from running in Windows 8.1?  I already checked to see if it was installed, but not turned on in Firefox, but the plug-in does not show up.