Use the registration machine, use the plug-in, use the system file editor, and reinstall.

1. Use the registration machine: find the registration machine for CAD, run the files in the registration machine, and remove the marks of the education edition.

2. Use plug-ins: Plug-ins can use their own functions to automatically remove the marks of educational CAD.

3. Use the system file editor: open the installation directory of CAD, find the system file, and modify or delete the mark of the education version through the system file editor.

4. Reloading: None of the above methods can solve the problem. You can consider downloading the reloaded CAD software.