When trying to boot Indesign it crashes and give me this crash report: InDesign CS6 Crash - Pastebin.com
Here's the steps I've taken so far:
MacBook Pro (15-inch, Mid 2012) running version 10.11.2
2.3 GHz Intel Core i7
16 GB 1333 MHz DDR3
NVIDIA GeForce GT 650M 512 MB
Go back to your previous O/S.
CS6 problems with El Capitan are widespread and Adobe is never going to update it.