GTA 5 for Lenovo g5030 2gb ram intel celeron x64 based procesor help! Can i download?

You can download it. It won't play but you could have it take up space in the hard drive and have a decorative icon on your desktop.

You can download the install file and keep it stored on the hard drive, but your laptop is nowhere near minimum specification to actually play the game:

http://www.systemrequirementslab.com/cyri/requirements/grand-theft-auto-v/12455/?p=r