Once updates end in October, Windows 10 won’t be secure and probably shouldn’t be allowed to connect to the internet. It will still continue to function though. You can buy a year of extended support for Windows 10 for $30, but it’s unclear whether there will be support after that.
Probably best to start switching to something else, or plan to run that PC offline.
Do it from their website (settings then account)so that you can fill out the exit survey and tell them why.