Lost it how? Had you definitely reinstalled after all the update shenanigans? The PS Store shouldn't have let you buy Heavy Freight without NTP so you could try reinstalling from your library. PS4 or PS5?
If you're on PS4, have you gone right to the bottom of the stack from the game icon to the Add-Ons section, all the way along to the right to the All Add-ons and checked that list?