I keep hitting this problem when I try to debug my Windows 8 apps and there is a copy already installed on another user account:
DEP0700 : Registratio
I just used get-appxpackage -all | where name -eq "PackageName" | remove-appxpackage -AllUsers on Win 10 v1903 after trying many other variations and it worked. I tested for the package's presence afterwards and it was gone.
get-appxpackage -all | where name -eq "PackageName" | remove-appxpackage -AllUsers