I might be a little late to the party, but I finally got it to work on Xbox One after stewing about it for months. Here’s what I did, if it helps anyone:
I own H1 digital (all seven episodes, no GOTY). H2 on disc. Everything installed. Kept getting the “Legacy Pack not available” message on the Store page.
- Go to the Store and download the free H2 Starter Pack (even though you already have H2 installed).
- Fire up H1, go to the Legacy Pack icon and click it to get the “not available” Store page.
- Search for Hitman Legacy (I think you have to do it from that page) and find it in the listings, you should see it for $39.99 at 100% Off.
- Download, it’s now available in the H2 menu.