Solved!
It was my mistake, I had to configure my mobile to accept unsigned apps. A friend of mine give me the solution. Thanks everybody!!

Hi there!
I've just tried to install ScummVM in my N95 8GB but I don't know which one is the symbian correct package and how to install it. Would yo be so kind to explain how do you managed with your mobile?
Thanks and excuse for my english, I know I need to improve it =^.^=