To XP or not to XP . . . ?

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51. You can "trick" XP into getting updates until 2019.

Windows Point-of-Sale is an XP version used in cash registers, ATMs and other specialized systems in a business or industrial environment. It's basically the same XP, just with a different tag or something. "Regular" XP has ceased updating, but the same XP updates are still being rolled out for Point-of-Sale terminals. See here for registry hack (must be comfortable with editing the registry)

DISCLAIMER: This is not an approved tactic by Microsoft and some users have reported problems. As always, back up your files and the registry (in the link is info on how to do this), and remember that as always, YMMV.

http://www.fixedbyvonnie.com/2014/06/trick-windows-xp-giving-updates-2019/#.VD6xQMlAtEA

You can also install an "unofficial" Service Pack 4 from a hobbyist developer, that's been circulating the Internet for some time now. What it does is install all the updates from Microsoft that have been released since SP3 up until April 8 of this year. It's similar to the "Update Rollup" for Windows 2000 that also had the nickname "Service Pack 5" or "Service Pack 4.5." Rated 3.5/5 at Softpedia.

http://www.softpedia.com/get/Others/Signatures-Updates/Windows-XP-SP4-Unofficial.shtml

Alternatively, you can manually download and install updates from Microsoft, automating the process by using the freeware app Windows Updates Downloader. As of yet I don't know of a way to install all of them at once and then restart when all finished (probably some scripting involved which I don't know how to do). But at least you'll have the updates saved offline for later use.

http://www.windowsupdatesdownloader.com/