How to solve "HD PACCAR" when Launch X431 Pad appears to check engine code

User feedback: I tried using Launch x431 Pro3s+ and HDIII on a kenworth and will not let me check engine codes, getting this message (HD Paccar not installed on your PAD).
What's up with this? What do I need for this to work with Paccar?

Launch x431 Pro3s check engine code


HD Paccar heavy duty software is not comes in default.

You have to purchase HD-Paccar software separately in “Mall”.