I have done the steps below but how do I do the actual upgrade from there.
To update Kart Racing Pro to a newer version:
1) go to the folder where Kart Racing Pro is installed ( usually C:\Program Files (x86)\Kart Racing Pro ) and backup the addons ( paints, dashes, tracks, ... )
2) manually delete the Kart Racing Pro installation folder
3) go to My Documents/PiBoSo/Kart Racing Pro/ and delete everything except license.ini