If you haven't been notified to upgrade to Windows 10, consider yourself lucky. The constant notifications have been an annoyance at best and disaster at worst, as business users click the button and unknowingly turn their computer into a security and privacy threat or break line of business software. Luckily, Microsoft has released a guide to turn off these 'upgrade now' messages and stop automatic upgrading, yet another issue. According to Ars Technica:
We have found free, simple solutions on the web for this issue before, but we are glad that Microsoft has lent an ear to our complaints and put out this guide.