Not sure what you’re getting at. Intel HD graphics can’t be downloaded. They are integrated into some, but not all, of the i3/i5/and i7 series chips. As a general rule, the higher the number the better the integrated graphics processor. HD2000 is not as good as HD 4000.
But none of the integrated graphics will help you play a game like Crysis. For that you need a dedicated graphics card, and a pretty good one at that.