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How to sideload a modern ui app on windows 8
Download the app's package the developer provided for sideloading.
Open the file.
It should contain :
A powershell script the application's. Appx package a security certificate app files, resources and dependencies.
Right click the powershell script and click' run with powershell' in the menu that appears. Click the' open' button in the security warning that appears.