GRASS 6.4.0 is currently installed in my computer. The script that I am trying to run is present in 6.4.1. It is stated in my previous post. If I installed 6.4.1, will my 6.4.0 still run? I don't want to risk uninstalling 6.4.0 since my project is currently linked to it.
You have to manually install it (in windows or Linux) in different folders. There will be no problem. Since both of the instalations are 6.4.x they can share the same grassdata.