Back in December 2022, I installed the Trend Micro Check - Browser Security 22.0.3 extension for macOS Safari.  My software installation log (a handcrafted FileMaker database) shows the extension has been upgraded to 22.0.4 and 22.0.6.

When I first installed the extension, I saved this link to the Mac App Store: https://apps.apple.com/app/app-store/id1564850025

When I click that link today, the Mac App Store pops up this error:

I tried searching Safari > Safari Extensions... for "Trend Micro" and "Browser Security" and found nothing that looks my Trend Micro extension.

Hi @wardclark 

Trend Micro Check reached its end of life/end of service last month. Please refer to the link for more information:

End of Service: Trend Micro Check - Browser Security for Safari