Kyuji's mixing up part of this I think. To get the Legacy Pack you have to open the store in Hitman 1, not 2. Getting the Legacy Pack there will give you access to the Access Pack for 1's levels in 3 as well.
Yes, this is what I did last night.
- I had Hitman 1 via PS+ (but not GOTY verions, yet) so I bought Hitman 2 Gold edition and installed it.
- Tried to redeem the Legacy Pack in Hitman 2 but it told me to do so in the Hitman 1 Store, so I installed Hitman 1 and exported the Legacy Pack from there.
- Back in Hitman 2, all Hitman 1 locations/campaign were now accessible except for the Patient Zero campaign (because I didn't have that in Hitman 1).
- Then went back to Hitman 1 and purchased the GOTY Upgrade (which is 80% off on PS Store) which then unlocked the GOTY Legacy Pack and unlocked the Patient Zero campaign in Hitman 2.
- Uninstalled Hitman 1 and for now I'll leave Hitman 2 installed in case I need to do anything for Hitman 3