There is no auto-installer for PNflashgames so you must install them manually.
Put the .swf in /arcade and make two gif's and put them in /arcade/images/ (you need to rename the gif's to gamename1.gif and gamename2.gif)
Then manually add the game in AdminCP > Arcade > Add Game and fill in the details - you should get game sizes and description etc from the .ini file that comes wit the game - and the gname (gamename) is the gname.swf minus the .swf
Make sure you download POSTNUKE version of the PNflashgames.
Hope that helps
This should also help to understand how to install games manually -
https://vborg.vbsupport.ru/showpost....99&postcount=2 and this one
https://vborg.vbsupport.ru/showpost....5&postcount=20