Maybe it's possible to give a more detailed error version if the script file is vor MTS1. Like checking for the (most common) error
"no viable alternative at input 'label'
and then issue a warning like "It seems like this script is outdated and unusable with MT0.3.5 and later".
So its more clear for endusers that the script is simply out of date, we got a bunch of these questions in the forums.