These types of apps (part of the Universal Windows Platform (UWP)) are usually available through the Microsoft Store, but there will be times when you’ll have to install them outside of the store. Depending on how you acquired the app, you’ll come across apps with a digital signature, which is a requirement before they’re submitted to the Microsoft Store, and those that might still be under development and are unsigned. While you can install digitally signed Windows 10 apps with a single click from the store and different sources, you cannot easily install unsigned apps. If you try to install an unsigned appx package, you’ll get the “Ask the app developer for a new app package. This one isn’t signed with a trusted certificate (0x800B0100)” error message. However, the installation isn’t impossible, you need to change the installation settings and use the PowerShell command-line tool. This guide will teach you the steps to install unsigned Windows 10 apps on your computer.

Install unsigned appx packages on Windows 10

It’s important to note that in most cases, you shouldn’t install unsigned apps on Windows 10, as they may cause harm to your computer. However, if you are a developer or trying to install a new Windows 10 app outside of the store, you can use the following steps to install the unsigned “.appx” package.

Enable Developers mode

If the app doesn’t have a digital signature, you must enable the “Developer mode” on your computer. Once you have enabled the developer mode, you can install the unsigned packages.

Install unsigned apps using PowerShell

If you are trying to install an app that wasn’t packaged, meaning that you have a folder with all content instead of a single .appx file, you will need to use the following instructions: If you have a “.appx” file, double-click it, and click the Install button. Or to avoid running into any issues, you can use the following PowerShell command:

After you complete the steps, you can launch the app from the Start menu like any other Windows application.

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