This is a plugin for quickly creating Lorem Ipsum text in Sketch
Copy the contents of the ZIP to ~/Library/Application Support/sketch/Plugins (you can get access to that folder by opening the Plugins menu, choosing "Custom Script..." and then clicking in the gear icon and choosing "Open Plugins Folder")
Select any text in Sketch and hit ( ⇧ ⌥ ⌘ L ) to run the script.
My thanks to Pieter Omvlee of Bohemian Coding for helping me better understand the API for Sketch.