No specific info about version 4.5. Please visit the main page of ROBOTC on Software Informer.
ROBOTC for Mindstorms is a powerful C-based programming language.
ROBOTC is a complete IDE for programming VEX Robotics microcontrollers.
The premiere robotics programming language for educational robotics.
It is a robotic programming language for educational robotics and competitions.
Robot Virtual Worlds is a high-end simulation environment.
ROBOTC for CORTEX & PIC will allow you to program VEX Cortex platform.