There is a discussion about the script on VI Control which is worth reading as it gives a number of tips
In this thread Problem with a transposing expression map entry, SampoKasurinen shows the correct settings for the script in his screenshots. All you need to do to use it is to copy the script into the relevant Kontakt scripts folder in your My Documents folder which on my PC is Native Instruments\Kontakt 5 (or 6)\Presets\multiscripts. One copy for each instrument using it, remembering to increment the channel as you go.