According to Microsoft's Windows lifecycle fact sheet, the company is slated to end support for Windows 10 for PCs version 1511 tomorrow. It's recommended that you upgrade your machine.
Version 1511 RSS
Today, Microsoft finally announced the date that Windows 10 version 1511 will be retired from support, which will be October 10, 2017. The company recommends upgrading to a newer release.
The latest cumulative update to Windows 10 brings improvements across the board, including to Cortana, Edge, File Explorer, startup, shutdown, Windows Store, device support, fonts, printing, and more.
In a confusing couple of days, Microsoft first pulled the November Update for Windows 10 and has now reinstated the update, chalking the removal up to certain privacy concerns.
For those who favor installing a fresh copy of the Windows 10 November Update, ISOs are now available for MSDN subscribers, while other users are able to do so using Microsoft's media creation tool.
The first major update to Windows 10 - tested by Insiders as build 10586, and now known as "the November update" - is now rolling out, bringing a range of improvements to the OS.