Installing .appx without trusted certificate?

Question

I have a Windows 8 app that I would like to deploy to my Windows RT 2. I only have the .appx, and I would like to just install it for testing by bypassing the s

Answer 1

If you're getting this error: App installation failed with error message: Install failed. Please contact your software vendor. (0x80073cf9) Please check you might already installed this app. Please uninstall and try again