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You receive the following error message when installing Antivirus for Mac:

Antivirus for Mac (version 11.0)

Invalid Serial Number

"Invalid Serial Number
This serial number works for another edition of Trend Micro security software. Click “Help” below for instructions on how to download the correct installer and try again.”


Antivirus for Mac (version 10.0)

Invalid Serial Number

"Invalid Serial Number
The serial number you provided is invalid. Please try again."

This issue happens if you used a different serial number or mistyped the serial number when activating the program.


Re-type your serial number
  1. Double-check the serial number of your program.
    • If you purchased your Trend Micro program online, you can find the serial number on the order confirmation email.
    • If you purchased the program from a retail store, look for the serial number in the sticker on the product box.
  2. Re-type your serial number.
  3. Click Continue.

If you still encounter the same error message, proceed to the next step.

Download the appropriate installer file

Using the serial number to activate a wrong Trend Micro software can result in getting the error message.
Serial numbers follow a different format for each program depending on how you acquired the serial number.

Download the installer appropriate for your subscription:


Serial Number starts with an X or M

If you purchased your subscription online or from a retail store and the serial number starts with the letter X, P or M, click the download button below depending on your macOS version:

macOS Version Installer
Big Sur (macOS version 11.0)

Antivirus for Mac 11.0

Catalina (macOS version 10.15)
Mojave (macOS version 10.14)
High Sierra (macOS version 10.13)

Antivirus for Mac 10.0

Sierra (macOS version 10.12)

Antivirus for Mac 9.0


Serial Number starts with a T

If you purchased your subscription from Best Buy, click the download button below depending on your macOS version and use the serial number that starts with TOEF or TCEF:

macOS Version Installer
Big Sur (macOS version 11.0)

Antivirus for Mac 11.0

Catalina (macOS version 10.15)
Mojave (macOS version 10.14)
High Sierra (macOS version 10.13)

Antivirus for Mac 10.0

Sierra (macOS version 10.12)

Antivirus for Mac 9.0


Trend Micro Subscription from your Internet Service Provider

If your subscription came with your Internet Service Provider, click the download button below depending on your macOS version and use the serial number that starts with the letter T:

macOS Version Installer
Big Sur (macOS version 11.0)

Antivirus for Mac 11.0

Catalina (macOS version 10.15)
Mojave (macOS version 10.14)
High Sierra (macOS version 10.13)

Antivirus for Mac 10.0

Sierra (macOS version 10.12)

Antivirus for Mac 9.0

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