differences between demo and game

Ok advice from anyone please and sorry if this has already been posted.

I tried the demo when it first came out and i couldnt get it to work, now can i ask a few questions?

Does the patch effect demo? (get it working)

Is it worth me risking to buy fm09 and hope it works? ( i a just under the recommended spec but thats only the graphics card)

Is the game much better than the demo now with the fixes?

I hope anyone can help me out there

The patch does not affect the demo I am afraid.

It should work with the patch but don't hold me responsible if it does not.

Well I have not played the full game much but I found the demo very good.