1 Message


70 Points

Wednesday, November 18th, 2020 10:51 PM


My serial number won't work after upgrading for Big Sur

I followed the instructions to upgrade to a version that supports Big Sur. Now it won't accept my serial number which begins with a T because it is a Best Buy purchase. I have repeatedly tried entering the password from my Trend Micro Account page to no avail. The Geek Squad was entirely unhelpful.

Brand User



579 Messages


9.4K Points

4 years ago

Hi, reachcor!


Welcome to Trend Micro Home Users Community.


I'm sorry to hear about your experience. Have you tried downloading the installer for Best Buy? Please try to download it from this link below:


How to install Trend Micro Security bought from Best Buy


Let us know how it goes.


- TM_Cathy

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