I've done everything on Firefox to get Adobe Flash Player to work, what's left?

I've done everthing possible to get the Adobe Flash Plug-in to work on Firefox especially when I'm trying to play Pogo Games.  I've uninstalled and installed the latest versions of Firefox and Adobe Flash player and each time I go to Pogo to play a game, I get the message "your flash player is out of date".  I've followed all the Adobe and Firefox prompts on how to get the Flash Player to work but nothing does.... What else can I possibly do?  I running Windows 10.