Thank you for asking here. I'm afraid that there's no way to cancel or delete a mail which already sent to a wrong email address. The good news is even someone received a download email from you, he/she still cannot activate the Internet Security completely since he/she doesn't have the necessary information to proceed with the activation.
You can also log into the Trend Micro Account page by the following URL to verify all your registration. My Account Sign In Page
Please let us know if you have more questions. Thank you.