Error attempting Sideload/install of Desktop Bridge App - The system cannot find the file specified 0x80070002

I am hitting an error when attempting to sideload/install (for QA test purposes) the .appxbundle built for my app with the Windows Application Packaging Project (i.e. Desktop Bridge within Visual Studio). The error is...

App installation failed with error message: The system cannot find the file specified. (0x80070002)

In troubleshooting this issue I have tried:

• Rebooting the PC then retrying the install (hoping any errant file locks would be released by a reboot)
• Installing the new appxbundle as an UPDATE (to an existing install)
• Installing the new appxbundle as a brand NEW install (after uninstalling the app)
• I even attempted sideload/install of an EARLIER version appxbundle that installed in the past without error and now that appxbundle also fails with the same error.

Any help is greatly appreciated!

All appxbundles now are installing without error (with no changes at all to them). As best I can tell it must have been something that MS was doing on their side. I presume that early in the install process, the app identity and/or security certificate is checked over the internet against MS servers and that part was off-line/not-available temporarily while they worked on my case. If you hit the same error as me, it could be because your machine has no internet connection (or something on the MS side is off-line temporarily).