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gHacks posted a quick workaround to install Windows XP security updates from Windows Embedded POSReady 2009, which based on Windows XP Service Pack 3



There is another exception to the end of support rule: Windows Embedded Industry, formerly known as Windows Embedded POSReady, operating systems continue to receive updates.

What makes this interesting is the fact that Windows Embedded POSReady 2009 is based on Windows XP Service Pack 3, and that the security updates released for that system are identical with the ones that Microsoft would have released for XP systems.

The extended support for Windows Embedded POSReady 2009 systems ends on April 9th, 2019 which means that you can use the trick to get another five years of security patches for XP.
  How to get security updates for Windows XP until April 2019