The read.me file in the zip folder is fairly self-explanatory and should guide you through. Our old friend J.D. Locke should also keep you from having a cornfield meet.
The activity requires the VSC North Arkansas Route and the DLW North Arkansas Equipment Pack. I have taken some pains to keep away from freeware "strays" and file conflicts. I hate those error messages as much as you do. If you encounter any problems, REPLY HERE! Don't bug Andre. I ran the activity a gazillion times too to perfect it, but with MSTS one never knows ...
I'm utilizing 1901 railroad protocol: Clearance Form "A", Form 19 Train Orders, etc. Fear not, you'll figure it out. "Jes' read them flimsies! Got that, Greenhorn?!"