Microsoft announced in May that, having reached its end-of-life, the initial release of Windows 10 (version 1507) would no longer receive monthly quality updates. Users still running the outdated version of the OS will now be prompted to update via a desktop notification, according to a recent post to the company's blog.
https://www.notebookcheck.net/Users-still-running-the-first-version-of-Windows-10-are-encouraged-to-update.231918.0.html