The newer versions of the orchestral instruments do not have a legato script. If you want to use the legato script, there are two choices:
1) Select an instrument from the "Legacy VSL Instruments" under the Orchestral bank. Make sure you select one from a "Legato Instruments" category, such as you'll find under the Violin Ensemble. Click the wrench to go into edit mode and then choose Script Editor by pressing the Script Editor button. The second tab shows the Legato Tool.
2) If you wish to use the Legato Tool with another instrument such as the new orchestral instruments, it's a little more involved. For some reason, the Legato Tool script doesn't show up in the Script menu. So, you need to follow the directions to step 1 above, go to the Preset menu under the Script Editor/Legato Tool tab, and choose "save preset...". Call it "Legato Tool". Now, open another instrument, go into edit mode, choose the Script Editor button, and select the Legato Tool preset from the Preset->User menu.
A lot of work to do something simple, I know. Hopefully, it makes sense. Good luck!