I just found a project that may use this component.
Just open the projects schematic file, ignore the warnings, left click on u4->open in symbol editor.
Then either save it into one of your libraries or save it to a new library.
How this could be done is explained in the tutorials mentioned above or in this thread:
The footprint is within the .pretty (footprint library) within library/LikeClockwork.pretty
Use this stuff carefully (Check if it is correct). The schematics is not very well designed. He should have used hierarchical sheets. (Or at least a lager canvas)