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