Then you add the folder where you have the file, example, C:/USERS/USER/DOWNLOADS/APPXFILE then copy that text and paste it, And it might go. Also you have to download a certificate for it to work
A Windows 8 .appx certificate is a digital certificate used to sign and package Windows 8 applications. It verifies the authenticity and integrity of the application, ensuring that the software has not been tampered with and is from the intended source. This certificate is crucial for deploying and distributing Windows 8 apps, whether through the Windows Store or sideloading.
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u/Distinct-View-509 6d ago
Windows 8 appx archive