There’s a lot of individual threads and specific cases that boil down to: “how do I get the GOTY stuff when I already own xxx?”
Here’s one thread with the path from xxx to GOTY. Always go to the in-game store for these options.You won’t always find the below options on the various platform stores themselves.
If you still have difficulties, please reply with your country, platform, what you own and what error/issue you have.
STEAM: Complete the Bundle
PS4 or Xbox One: See below.
If you’re a completely new HITMAN player:
*Get the digital GOTY Edition. That gives you The Complete First Season and the GOTY content.
If you already own The Complete First Season, including the Bonus Episode (digital):
*Get the GOTY Upgrade. That gives you the GOTY content.
If you own at least the Intro Pack (Prologue & Paris) but not all of the individual episodes:
*Get the GOTY Upgrade (Intro Pack). That gives you whatever episodes you are missing (including the Bonus Episode) and the GOTY content.
If you own a new copy of The Complete First Season (disc):
*Get the GOTY Upgrade (disc). That gives you the GOTY content.
Note: You need to redeem the code/voucher in the box for the Bonus Episode to get full access to those missions and the GOTY content.
If you own a pre-owned version of The Complete First Season (disc) without a Bonus Episode code
*Option 1: You will need to acquire a code for the Bonus Episode (through Amazon, for example) and then purchase the GOTY Upgrade (disc). That gives you the GOTY content.
*Option 2: Get the GOTY Upgrade (disc) but you will not have access to the GOTY content that takes place within the Bonus Episode; i.e the Cheveyo Calibration Escalation / Sieger 300 Ghost unlock.
Option 3: Technically, another option is to get the GOTY Edition. That will give you the GOTY content.
UPDATE 2: (March 21) The issues with PS4 players in the US being unable to buy the “GOTY Upgrade (Intro Pack)” have now been fixed.
UPDATE (March 13) - If you’ve been having issues purchasing the “GOTY Upgrade (Intro Pack)” on PS4 in North America, we’ve requested a change to the set-up from Sony to make sure that anyone with the ‘Intro Pack’ (meaning you can play the ICA Facility and Paris) are able to buy this upgrade. That change will come into effect before or on the 19th March 2018.