Sideloading of Modern UI apps to Windows 8/Windows RT is possible. There are several restrictions/pre-requisites though.
You'll need either
- Windows 8 Pro
- Windows 8 Enterprise
- Windows RT
Windows 8 Pro
With Windows 8 Pro, you can sideload Modern apps, albeit only if you have a Windows 8 developer license. The license is free, but you'll need to use PowerShell(or alternatively, install Visual Studio - which would be installed if you're actually developing an app anyway) to acquire the license.
Once PowerShell is launched as an Administrator, enter the below to acquire the license
Click on Agree & login with your Microsoft Account to get the license. Once acquired, enter the below command to sideload the app
replacing example.appx with name of you package.
Windows 8 Pro/Enterprise/Windows RT
For Windows 8 Pro without a developer license or for Windows RT/Windows 8 Enterprise, you'll need to acquire a sideloading activation key. The activation key can be purchased from Microsoft. Once you've acquired the activation key, you'll need to register it by opening the command prompt and type the following:
slmgr /ipk <activation-key>
<activation-key> with the activation key.
Alternatively, if you have Windows 8 Enterprise which is joined to an Active Directory domain, the domain needs to have Allow all trusted applications to install Group Policy setting enabled. Here's how you can enable the Group Policy:
- Open the Group Policy editor (gpedit.msc).
- Under Local Computer Policy, click on Computer Configuration, Administrative Templates, Windows Components, and then App Package
- Double-click the Allow all trusted apps to install setting.
- In the Allow all trusted apps to install window, click Enabled and then click OK.
Once the key has been activated or the Group Policy has been added, you can sideload by typing: