realtime springs

I tried several times to use that realtime spring script in max 9. Each time I run it I get an error. I downloaded and watched the video and very hard to understand but i notice there is a UI that should come up with the script.

Also he drags N drops the .mse into the viewport.

This script doesn't comes as a .mse but .ms

So I made a box chain like in the video and selected the root and then tried to run the script nothing, just an error.

Anyone else have this problem??

Thanks