1. Install SystemModeler_4.0.1_WIN and start the program
2. Click "Other ways to activate"
3. Click "Manual Activation"
4. Copy the MathID shows in the dialog
5. Open windows command prompt,run SystemModeler_4.0.1_Keygen.exe
paste the MathID(If you directly click the SystemModeler_4.0.1_Keygen.exe,
you can't use paste,and you can't see the Activation Key and Password)
6. Copy generated Activation Key and Password and paste those to activation dialog
(The Activation Key is always 1234-4321-123456)