PC: https://www.origin.com/en-us/store/buy/titanfall/pc-download/addon/titanfall-season-pass
Xbox One Season Pass: https://store.xbox.com/en-US/Xbox-One/Dlc/Titanfall-Season-Pass/b58c27b9-9cc1-4031-a37a-4c8e192a95b5
For xbox 360 you have to do it with each map pack individually.
IMC Rising...