Playing Downloaded games on PS3

i was messing around the PS store.... and saw the game echochrome.
pretty neat idea and its all about perception.
i downloaded the demo (free)
completed it then debated for like 5 minutes if i should spend $9.99 on the full version of the game.
i had $12.12 in my account so i said SURE ....why not?
the game is on my list of downloads
above
the demo -echochrome
dantes inferno demo
GoW III demo
How come it wont install? it keeps telling me there is a later version already installed....and how come i can choose an option to PLAY?
did i just waste $9.99?

:helpme:
 

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