You can now remotely install an app in a simple way. No need for Windows 10 SDK to get winappdeploycmd, You can use Device Manager in a browser locally or on the phone to do it. Here's how. The previous blog covered the basics about app packages, deployment and setting up for sideloading. This blog covers remote app installation and in phone app installation using Device Manager running in a browser.
if you set your Windows 10 (Mobile) Phone in Developer Mode (perhaps Sideloading is all you need) then you can fire up a web browser where the Appx file is located and remotely install the app on your phone. Alternatively you can actually file up the (Edge) browser on your phone after copying the package to it and install the app package there!
To update the app just install as below.
To Reinstall, delete it first:
Download the appx zip file or copy over USB to say, Downloads folder on the phone.If using USB you can just copy the whole folder.
Unzip the file (you will need zip app . I use 8 Zip Lite.
Now wasn't that easy!