To activate , you need a unique 32-digit Activation Code provided by Steinberg upon purchase. Because Cubase 10 belongs to the older "eLicenser" generation of software, the process differs from the modern "Steinberg Licensing" used for versions 12 and 13. Where to Find Your Activation Code Email Confirmation

Depending on how you acquired the software, your code will be located in one of three places:

The only real "activation code" you can get comes from an authorized Steinberg retailer (Sweetwater, Thomann, Guitar Center) or Steinberg’s own online shop.