Updating your calculator's operating system or adding new applications requires just a few steps: TI Connect™ Software | Texas Instruments

For users of the TI-Nspire CX II or CX II CAS , this software acts as both an emulator and a file management system. It typically requires an activation key found on your calculator’s slide case.

This is an emulator used primarily by teachers to project a working calculator on a screen for classroom demonstrations. 2. How to Download and Update Your Calculator

This is the standard free software for the TI-84 Plus family (including the CE and Python models). It allows you to send files, update the OS, and capture screen images.