The “How to Geek” site illustrates this easy technique to stop reminder messages.

https://www.howtogeek.com/408556/how-to-avoid-windows-7s-end-of-support-nags/

Windows 7 will soon start nagging you to upgrade to Windows 10—again. Specifically, you’ll see a message informing you that Microsoft will officially stop supporting Windows 7 on January 14, 2020. Here’s how to avoid it.

Microsoft will only support Windows 7 with security patches until January 14, 2020. That’s the “end of support” or “end of life” (EOL) date. After this date, Windows 7 will technically leave “extended support.”   We strongly recommend upgrading to a supported operating system by January 14, 2020. You’re using a supported operating system until then—so feel free to hide the nags and use your PC.

All the message does is inform you that Windows 7 will no longer be supported on January 14, 2020, and provide a link to Microsoft’s website with more information.  More importantly, there’s a “Do Not Remind Me Again” checkbox at the bottom left corner of the window. Enable this checkbox and Microsoft will hopefully stop bugging you. However, if you don’t enable this checkbox and just close the window, you will see the end of life notification repeatedly.