The thing is, this mod works only offline, so even if it will be ported, you couldn’t complete any achievements with it. That’s why personally I think the sense of doing that is quite small.
HITMAN 3 is current, alive and updatable game, so buying and playing it would be the best decision.
To be honest, personally I don’t see any other reason of having this or any other new mod for old games.
Edit: if happens you need this mod to play all existing Elusive Targets in HITMAN 3, install this mod for HITMAN 3 that enables all ETs from previous seasons for Offline Elusives mod