The first step to install the appx application in Windows 8 is to install the certificate of the appx application, that is, install the certificate of the appx application to the "Trusted Root Certification Authority", and then install the appx application. Below, Chief Microsoft will explain in detail the steps to install the certificate: 1. Right-click on the appx application package to be installed - Properties, and switch to the "Digital Signature" tab. As shown in the picture: Win8 appx application certificate installation tutorial

2. Select the signature in the signature list, and then click "Details" in the lower right corner. As shown above:

3. In the pop-up "Digital Signature Details" window, click "View Certificate". As shown in the picture: Win8 appx application certificate installation tutorial

4. Click "Install Certificate" in the pop-up "Certificate" window. As shown in the figure: Win8 appx application certificate installation tutorial

5. In the pop-up "Certificate Installation Wizard" window, select "Local Computer" for "Storage Location". As shown in the figure: Win8 appx application certificate installation tutorial

6. Click "Next" and select "Put all certificates into the following storage" in "Certificate Storage". As shown in the figure: Win8 appx application certificate installation tutorial

7. Click the "Browse" button and select "Trusted Root Certification Authority" in the pop-up "Select Certificate Store" window. As shown in the figure: Win8 appx application certificate installation tutorial

8. Click "OK" and "Next", and then it will prompt that the certificate "import" is successful. As shown in the picture: Win8 appx application certificate installation tutorial

Finally, click "OK" to close all windows.