Hi there! my problem is : I install afer effects cc 2015. but when I install 3D Videocopilot, crash and give an error that says element is missing, I want to use 3D flag but cannot cause this issue.
Nobody can tell you anything without proper system info or other technical details. Start by downloading the latest Element 3D version and install it.
Make sure you have the versions of your 3rd party plug-ins that have been updated for 2015.