Where it always has been: Effects --> Perspective.
You can also type 'sphere' in the search field in the Effects & Presets panel to find it.
If that doesn't work for you, then we'll need a lot more information to help you. Please provide answers to the questions listed here: "FAQ: What information should I provide when asking a question on this forum?"
There were older versions of AE that required separate installation routines for the Cycore effects package. What version are you using?