How to install digitally not signed apps in Windows 8
Default settings of Windows 8 won’t allow you to do install Windows Store not signed apps. If you have an app and want to deploy it for testing purpose, there is a method called development sideloading. A policy or registry key needs to be set to allow trusted apps to run. Here is how you can change the setting.
1. Login in Windows 8 desktop using administrator access rights.
2. Launch ‘Run’ dialog box using Windows Key + R combo or Right-click on Start button and choose “Run” from context menu.
3. In the Run box, type REGEDIT and hit enter.
4. This will launch Registry Editor. In the Registry Editor’s left pane, navigate to HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Appx. If you don’t have the Appx key, you can create it yourselves. Right-click on “Windows” key, select “New”>”Key”, then enter Appx.
5. Now the key is created. Right-click on the Appx key and make a new “DWORD (32-bit Value)”. Name the DWORD as AllowAllTrustedApps. This will be created in the right pane of the registry editor.
6. Double-click on the AllowAllTrustedApps (REG_DWORD) and enter its value as 1. Click OK.
You may now close the Registry Editor. Now your Windows 8 can run Windows Store not-signed apps on your PC.