After the launch of Windows 11 and a renewed focus on the Microsoft Store, developers are flocking to publish their apps on the official store. We recently compiled a list of the best Windows 11 apps and found that the most popular apps are available on the Microsoft Store. That said, some users still prefer to install apps via the installer file. Most apps on Windows 11 are packaged with the modern MSIX or MSIXBUNDLE container, and they don't install easily without verified certificates. Therefore, users get error like "Publisher could not be verified" when loading MSIX or MSIXBUNDLE packages on Windows 11. So in this article, we provide you a tutorial on how to fix "Publisher could not be verified" error in Windows 11.

We have mentioned two methods to fix "Publisher certificate could not be verified" error in Windows 11. If the first method doesn't work for you, move on to the next solution.

If you get an error message like "This app package's publisher certificate could not be verified" in Windows 11, don't worry. There is an easy way to install the root certificate with a verified signature. This method is applicable for both MSIX and MSIXBUNDLE packages. This is how you do it.

1. In this method, we will install Rise Media Player, which is an excellent open source media player for Windows 11. As you can see below, when you install the MSIX package, it throws “Publisher certificate could not verified ” error and does not allow the user to install the app.