Q. When I say "Alexa, launch WayScript and run 'Hello World'", Alexa replies "You have WayScript enabled, Do you want to open it?" No matter what I say next, nothing happens.
When you get the "You have WayScript enabled, Do you want to open it?" response, Alexa was able to understand "WayScript," but could not understand the rest of the command.
In order to help Alexa better understand the command, you may need to enunciate it more clearly or slowly. Getting closer to the Echo device can help, as can doing Voice Training by saying "Alexa, learn my voice."