I got a new MAC with OS X El Capitan, and now I can't open After Effects.
I can however, open Premier Pro. Any insights?
What version? Is it up to date. What error message are you getting. With proper administrator permissions and the latest builds of AE you should be able to run the program.
If you are running CS6, you need to update AE to 11.0.4.
Retrieving data ...