can't find a download link? it sounds like you are on the PlayStation. if so, you can go to the PS Store go to your downloads list to queue the download for your system. the next time you turn on the specified system your download will start.

or

on the PS3 you go to Account Management in the PlayStation Network column. then Transaction Management and you will see Download List. just go through that til you find the game.

on the PS4 it's pretty easy. just browse to your Library and download the title.