The rules of the Apple App Store don't allow Right Click Booster to install scripts for you.
However - apps from outside the App Store don't have that restriction.
If you want an easy way to install scripts, download the RCB Script Installer here.
It will integrate with Right Click Booster to install scripts when you want them.
Alternatively - you can use the options within Right Click Booster to drag scripts manually to the right folder.