You only need to follow these steps to download and set up the McAfee antivirus on your Windows or Mac computer:
Visit https://www.mcafee.com to start.
Click My Account to continue.
Afterward, choose Sign In from the menu.
Click the login button now. Enter: The McAfee account email address.
Moreover, your McAfee account password.
Go to the My Account window first.
Select "Subscription" from the menu.
Next, select Add Device by clicking the button next to the install product button.
Select the Windows or Mac operating system.
Choose Send Link, then enter the email address associated with the PC or Mac account you wish to install.
Select "Send Email" from the menu.
Get started by going to the email programme.
Go to McAfee now and access your email.
The download link must then be entered in the email box.
Follow all the popup instructions to finish the installation process.
Reference Link: How to Download and Install McAfee Antivirus Protection