I'm putting this here because of Mr. Bell's remarks last year about Window's incessant & increasing nagging to upgrade to version 10. I tried it, then reverted to 8.1 after 3 weeks.
Windows 10 may be decent to run the right software on, but with a minimal Windows installation using the default Web browser, it's clearly inferior. Although it advertises compatibility settings, Windows 10 doesn't run a version of Internet Explorer that you'd think would be recent enough to work even with Microsoft's notorious lack of backward compatibility. The browser that comes with Windows 10 is Edge. You would think it was a demo version, it's so weak. You can't simply download to local disk a page you're looking at with it. When downloading is an option provided by a link, Edge doesn't query you as to which directory to put the file into. Edge has hardly anything in the way of settings the user can adjust. When you open a new window or tab of it, it doesn't provide a direct URL input line, only the search line.
Windows 10 comes with no dedicated help feature, substituting Cortana, which is just another Internet search engine. "Ask me anything," and I'll get you to the same places you could've searched yourself.
As I was on the point of reverting (the option to do which is granted for a month), I was pushed over when either Edge or something else started jamming local disc read-write traffic, as reported by Task Manager, hanging the system for ~20 mins. at a time. Cortana leads to other users complaining of the same.
Whatever gains were to be had by upgrading to Win 10 were inapparent to me, while its faults (both design & implement'n) were obvious.