Correct I had a fleet of IH and that is what I had to do but for me they were local school busses and we cut them back, only our trip busses we left at factory. Drivers used to try and bribe me to set them up to go even faster on the highway. And the new IH program is online only access. My old program was bootleg on the laptop onlyInternational engine software
Laptop
A 1939 pass through device
And hope there is not a password in the engine
Or just go to the dealer and have them do it,