Hello,
I tried following your instructions for a Lumia950 on Windows 10 mobile v1709, and I get this error when I try to install the App Installer (v2019.1019.1.0):
Unable to Install
There's a problem with this app. Check the package or contact the person who gave it to you for help.
Hello,
I tried following your instructions for a Lumia950 on Windows 10 mobile v1709, and I get this error when I try to install the App Installer (v2019.1019.1.0):