Further to my post to you yesterday, I have now downloaded the Zibomod Boeing 737-700U and have extracted the large 1.8GB zip file to the C:\X-Plane 11\Aircraft\ folder, which now looks like this:- C:\X-Plane 11\Aircraft\737-700 04-28-2019.
You will note that the downloaded Zibomod folder has a slightly unusual name, made up of the aircraft model number and the file release date!
PLEASE ALSO NOTE FROM THE READ ME FILE THAT YOU ARE ADVISED NEVER TO INSTALL THIS AIRCRAFT IN THE LAMINAR RESEARCH FOLDER!!!!
In any event, all liveries for this aircraft type can be found in the C:\X-Plane 11\Aircraft\737-700 04-28-2019\liveries folder, as per the first photo below
When you open up X-Plane 11 and choose the B737-700U aircraft, plus your livery of choice, you should see something similar to the second photo below.