TI 에 문의메일을 보내서 답변을 받았습니다.

I understand you are having a problem using your TI-Nspire CX CAS Student Software. I am happy to assist you.

Make sure you have your license number. Please uninstall the software completely from the computer and delete all the TI-Nspire folders in the directory below:

- C:\ProgramData\
- 32-bit C:\Program Files \TI Education\
- 64-bit C:\Program Files (x86)\TI Education\
- C:\Users\[UserName]\AppData\Roaming\Texas Instruments\

Visit the following URL and reinstall the software under full administrator rights:

https://education.ti.com/go/cx/34s

하지만 그대로 따라해봐도 똑같은 문제가 발생합니다.