Yesterday, I finally go round to trying to update the apps on my wife’s computer, and found that the Windows Phone app wouldn’t update, and returned the error
Looking that up, it says that you need to have a developer license.
That’s a bit odd, because, that app isn’t being sideloaded, it’s being loaded from the store.
However, I hadn’t debugged on her machine for awhile, and as a result, it transpires that my developer license had expired. Acquiring a new license magically fixed the problem.
It appears that removing the license might also have fixed the job.
You can do that with powershell by using this command (source http://msdn.microsoft.com/en-us/library/windows/apps/hh974578.aspx)