first of all, u cant download any gamerscore, and second why would u want ur gamerscore high, if u even didnt play the games that they come from -.- dont u think Microsoft will catch u and ban u of 360 Live -.-
I have a person on my friends list with over 80,00o g's and a good 70% is all gamesaves, or as you say downloading gamerscore, it's supposed to be easy just involves downloading a save file from a website onto a memory card for 360 and putting it on ur 360 a la de da there you go 1,000 g's, but don't do it, ruins the whole point of gamerscore in my opinion.