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Psp Demo Problem???HELP!!?

So I downloaded the psp demo from the playstation store and also the psn downloader thing you need.when i transport the games to the psp, the status bar for transfering it, always stops @ 50-60 percent.when its starting, in the top it says,”transfering dataa” or something like that.then when its done that,it says “installing”.thats when its says.”error”.when i check my psp, it has the game but when i press it,it says,”the copyright protection information is invalid”.then it wont let me play thte game.what am i doing wrong?the same thing happened to 2 games i tried to put on my psp.i know it transfer allright because i can see the game in the psp but then i cant play it.
i have firmware 4.05 on it

dont know, try downloading it on your computer, then put on psp

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