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http://www.softpedia.com/get/Others/Signatures-Updates/Windows-XP-SP4-Unofficial.shtml
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Some five months after Microsoft ended support for Windows XP, a developer is preparing to make an unofficial service pack for the 12-year-old OS available on general release.
Using the project title of Unofficial Service Pack 4, Greece-based developer harkaz started work in September 2013 on bringing together all the official updates from Microsoft in a single package.
Unofficial SP4, which is available in a third beta version, is soon to be finalised in a release candidate, according to harkaz, who said in a blogpost this week, "I have already started working on the SP4 RC build."
In his description of the Windows XP service-pack project, harkaz said: "Many users — including me — who won't be able to upgrade their old machines to a newer OS would like to easily install all Windows updates in one convenient package. For this reason, I started working on a Service Pack 4 package."
According to harkaz, Windows XP Unofficial SP4 is a cumulative update rollup for Windows XP x86. It can be applied to a live Windows XP system that has a minimum of SP1 installed. Alternatively, it can be integrated in any Windows XP installation media.
Estimates vary on the number of desktops still running Windows XP. However, Netmarketshare's numbers for July 2014 still give the operating system, first released to manufacturers in August 2001, a 24.82 percent worldwide share, down from 37.19 percent a year earlier.
One of the places from which the unofficial service pack can be downloaded is Softpedia, whose description of the software carries a note of caution: "Please be advised that this package is not released by Microsoft, who does not recommend computer users to install it."
Elsewhere the site says of the harkaz service pack: "If you decide to install this service pack, keep in mind that it's not related to Microsoft in any way and is just an unofficial release that might or might not help you protect a Windows XP computer against vulnerabilities found in the operating system.
"Of course, Microsoft does not recommend anyone to install this, but such a service pack is clearly worth a shot if you're still on Windows XP and you don't plan to upgrade anytime soon."