Licenses between Distribution Platforms. When purchasing Digital Titles such as games and DLC you buy the License for it not a real physical tangible disk.
For PC they don’t have a single unified digital distribution platform. To name a few.
-
Steam
-
GOG
-
Epic Game Store
-
Origin
-
Windows 10 Store
The issue with Hitman 2 is that people’s access/License for that content is tied to Steam and their respected Steam Account it isn’t a unified storefront where you can just expect to own something on someplace different.
Now if you wanna know why you don’t have said content available it’s just a bunch of legal lingo that is used in User Agreements that companies ask us to read, but we don’t and we voluntarily agree with it while being oblivious to the stuff we allow them to do.
https://store.steampowered.com/eula/243950_eula_0
So essentially the process to get content you “Own” is gonna be behind closed doors between Steam, Epic, and IO.