Check out the updated version for MacOS made by my partner Kay Yin: https://github.com/HiKay/macOSLucidaGrande
ATTENTION! - There are issues that we (apparently) can't work around at this time.
The font patch works, but there are visible artifacts and it doesn't integrate as smoothly as it did back in Yosemite.
A small Apple Automator application which makes it possible to use the traditional Mac OS X system-font "Lucida Grande" on OS X 10.11 El Capitan.
Download : https://goo.gl/33KNpm (Version 1.0)
Or browse to /Packages and download the latest ZIP manually.
Font patch created by Ken Yin - https://twitter.com/iOSight
Application and site created by schreiberstein -<schreiberstein@gmail.com
"Like" on Facebook : https://www.facebook.com/systemfontyos
Tested on OS X 10.11.0 El Capitan (15A282a)
This application adds an additional font file - No system files are changed!