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You can obtain the serial number from the order confirmation mail or CD.
Provide the serial number of your software on the box given and then choose Continue. When you are instructed to agree to the License Agreements, select the Agree option. Select Continue, then study the License Agreement, and then click on the Continue button again. Study the instructions that are mentioned on the Privacy and Personal Data Collection Disclosure screen. Click Continue and then choose the Continue button again on the Welcome pop-up window. Continue with the installation by choosing the Open button on the Security Warning dialog box.
Then, open the Trend Micro install Antivirus file on your Mac desktop and then click on the Install Antivirus option.
dmg or installer file of the Trend Micro Antivirus software and then save it on your Mac system.