There is a much simpler set of key presses to achieve the desired results.  I have not messed with AHK in a while, since before W10, and, at the moment, I cannot get the script to work.  Maybe someone with more time can work out the details in AHK.

The idea is this.

In scroll view, there is a much underused ALT command that highlights the number box next to "Measure:" in the lower left of the screen.  Once the box is highlighted, with whatever the current measure number is, you can press either the up or down arrow to increase or decrease the number in the box respectively.  Once you have the desired number in the box, press return and the window will scroll to that measure.  If you want to just scroll one measure at a time, just press the up/down arrow once, then press return.

Thanks for the suggestion, Motet, but,

I put on my thinking cap and resurrected that the script must be run as an administrator.  Just right click on the script icon, and choose "Run as administrator", and all is well.