Installed Flash Player 11.5.502.110 repeatedly but UTube says I need to upgrade to play video. Why?

I have repeatedly installed Flash Player 11.5.502.110 but it won't work.  When I go to YouTube, it says, "You need to upgrade Adobe Flash Player to see this video."  When I go into websites, like worshiptogether.com and click the play button to listen to a song, the button goes to a square icon and will not play.  Help, please!