How to remove devices you've installed apps on from your Windows 10 Store allowance

[Windows Central]

Windows 10 apps can only be installed on a maximum of 10 devices at any one time. That sounds like a lot, but it will include any Windows 10 devices. Old phones and tablets you no longer have, for example, same deal when you get a new PC. The old one may still be taking up some of your allowance.
Fortunately it's incredibly easy to keep track of and remove old devices. Here's what you need to do.

Full story from the WindowsCentral blog...