Pursuit Force Demo Problem

[keys]

I received my first PSP Demo in the mail. It is Pursuit Force a action/racing/shooting game. It requires 2.5 firmware. I have 1.5 firmware and do not want to upgrade. I tried both version changers and the wab launcher(usually works).
Any suggestions? I would like to try out this game.

Thanks

[TimeJack]

how do u get umd demos in the mail? =(

[keys]

how do u get umd demos in the mail? =(
I signed up for the Playstation Underground with the card that was included with the purchase of my PSP.
I receive demos for the PS2 for the same reason.