How to Fix “Publisher Could Not Be Verified” Error on Windows 11

Installing Verified Certificates

  1. Right-click on the MSIX/MSIXBUNDLE package and click on Properties in the context menu.
  2. Move to the Digital Signatures tab and click on Details. If Digital Signatures does not appear here, move to the next section for a working solution.
  3. Click on View Certificate.
  4. Click on Install Certificate.
  5. A new Certificate Import Wizard will open up. Here, select Local Machine and click on Next.
  6. Choose Place all certificates in the following store and then click on Browse.
  7. In the tiny pop-up window, scroll down and choose “Trusted People” and click on “OK”.
  8. Click on Next and Finish to import the certificate.
  9. As you can see here, the signed certificate has been installed.
  10. You can install the app without any errors now.


PowerShell

  1. Right-click on the APPX/APPXBUNDLE package and click on Properties in the context menu.
  2. Under the General tab in the Properties window, you will find a Security option at the bottom. Here, check the box against Unblock and then click on OK. This is a preliminary action meant to allow the application to install.
  3. Double-click on the app and try installing it. If it’s still showing the error, move to the next step.
  4. Right-click on the MSIX/ MSIXBUNDLE package and click on Show more options.
  5. Click on Extract to “folder\”. This will extract the package and will create a folder in the same directory.
  6. Open the extracted folder, and you will find an AppxManifest.xml file.
  7. Right-click on the XML file and choose Copy as path. This will copy the file path to the clipboard, which we will need later on.
  8. Before we install the app using PowerShell, we need to change an important setting on Windows 11.
  9. Open Developer settings.
  10. Enable the toggle next to Developer Mode. This will allow you to sideload MSIX/MSIXBUNDLE packages from any source, even without a certificate.
  11. Open PowerShell as Administrator.
  12. Enter the command: Add-AppxPackage -Register filepath. Replace filepath with the path of the XML file you copied.
  13. As you can see here, the app has been installed on my Windows 11 PC. Bear in mind, you can’t delete the extracted folder as that’s the source from where the application is running.