I was struggling with a problem during development of an app. I’ve had this before – build failed with the message:
“DEP0700 Another user has already installed a packaged version of this app”.
Because there are more than one user on my PC I most of the times could fix this by logging in to the other accounts to remove the app and then it would work. But not this time. No other installations that I could find, but the error remains. Also after reboot.