What are your system specifications and are you trying to install the digital download version or from the Retail DVD? Are you getting any error message, if any
Make sure you have good amount of disk space. You need at least 4 GB free disk space to install the game. If you've got the Retail DVD. Check to see that the DVD is not scratched by any chance. You may try to clean it. Typically you'll know this if the disk is making continuous noise and if the light of the CD/DVD drive is flashing green.
But first you need to give us more information otherwise no one would be able to help you.