How to install a Windows 8 App Without Submitting to Store [closed]
Use the PowerShell cmdlet add-appxpackage. For example:
add-appxpackage C:\myapp.appx
See http://blogs.msdn.com/b/uk_faculty_connection/archive/2012/04/03/installing-enterprise-metro-apps-without-using-microsoft-store.aspx for more info.