Adobe stopped developing and supporting Flash on Android. ICS was the last release to have Flash. Adobe removed Flash from the Play store on August 15th.
I know that people have found a work around for the Google tablet so you might want to visit their forum to see if you can get the same tricks to work for you. Personally i don't have Flash on my Xoom or my phone. In fact, I don't allow Flash on my Windows computer - has often been a great way for people to attack computers. But this is just my personally feeling, but I can't wait for Flash to die.
Here's a link to my flash player apk before it was removed from the market. The link will take you to a dropbox link, just click download on top right, then go to your download app and just click, it will ask if you want to install.