After you have registered your oscilloscope on Tek.com, you should have received an email with instructions.  The email is sent to the address you used to login to tek.com.  If you haven't received the email after registration: Check your spam folder incase the email ended up there. Re-check the model and s/n you used to register your oscilloscope. The model number should be entered without any spaces (i.e. DPO2014, MSO56).  The s/n is composed of an alpha letter followed by 6-digit number (C012345).