No, don’t get me wrong - I’m just busy at work so I don’t always have time for a proper reply 
You forgot to tell me if you actually created a new file in the scripting console? Judging from the image, it doesn’t look like it.
You can create a new file by selecting “new” in the file menu. Paste the code from above, and save the file next to the “TestPad.lua” file.
Then, execute the code by hitting the small button in the corner → “Execute”.
This should send the sysex code to the APC, which should enable the mode.
Notice that I wrote should two times? Because, I don’t have an APC and I only briefly scanned the manual. I’m just guessing how the APC might react to the “mode change”, the track select buttons should work differently then. I’m sure someone else who’s using the APC can confirm that this is how it’s supposed to work?
Satobox is using the bleeding-edge (0.95) version, which you can get here. The Navigator is part of that update.