Thanks lot gentlemen for your kind support.
For beginner like me (or even experts) simplify code usually is one of the criteria at building script. Therefore, I am just thinking what if we instead of this part (checking JT.exe existence) which contain about 20 lines of code, modify the script to generate error message if JT.exe was not found in the @Curdir then programmer will easily add the file.
Simplify code will allow easer debugging.