Depending on how you acquired the software, your code will be in one of three places:
If Cubase came with an interface (like Focusrite or Yamaha), log into your hardware manufacturer's portal (e.g., the Focusrite My Software page ) to claim your code. 2. Using the Steinberg Download Assistant
Cubase 11 relies on the software. This is where the actual "handshake" between your computer and Steinberg’s servers happens.