Serial number invalid error in Trend Micro Antivirus for Mac

You may see this error while installing Trend Micro Antivirus for Mac:

"The serial number you provided is invalid."

Why did this happen?

You may have mistyped the serial number when activating the program.

How do I fix this?

Re-type your serial number:

1. Double-check the serial number:
   • Online Purchase: Find the 20-digit serial number on the Order Confirmation Email.
   • Retail Purchase: Look for the 20-digit serial number on the product box or on the receipt.
   • Existing Subscription: Log in to your Trend Micro Account to see the list of your ongoing licenses.
   Example format: AAAA-0000-0000-0000-0000.
   'A' represents a letter; '0' for a number.
2. Enter the serial number, then click Continue.