Адобы по этому поводу давно высказались:
Brainstorm has been removed in After Effects CC 2015. You can still use Brainstorm in After Effects CC 2014 and earlier versions/releases.
You can read about using Brainstorm in AFter Effects in the Use Brainstorm to experiment and explore settings article.
т.е -если нужен Brainstorm -последняя версия его содержащая -АЕ СС2014.