Go to Trend Micro Homepage. Download and install the software using the trial period/free version. Complete the installation process*. Restart your PC. Open the software and use the purchased key to activate it. *Note: It is important to install your software without using the key. 

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Disk space: 1.3GB (1.5GB recommended) Windows 10 Family (32 or 64-bit) CPU: 1 GHz Memory: 32-bit: 1 GB(2GB recommended); 64-bit: 2 GB Windows 8 Family(32 or 64-bit) CPU: 1 GHz Memory: 1 GB (2 GB recommended); 64-bit: 2 GB Windows 7 Family (32 or 64-bit) and Service Pack 1: CPU: 800 MHz (1 GHz recommended) Memory: 1 GB (2 GB recommended); 64-bit: 2 GB Windows Vista Family (32 or 64-bit) and Service Pack 2: CPU: 800 MHz (1 GHz recommended) Memory: 512 MB (1 GB recommended) Web Browser: Microsoft Internet Explorer 9.0 or 10.0, 11.0 Mozilla Firefox latest version Google Chrome latest version Display: High-colour display with a resolution of 800x600 pixels or above (Desktop) PDF Reader: Any