It provides a convenient and quick way to update system components, so as to increase the PC's security and remove possible vulnerabilities, although it does not guarantee complete protection. The Windows XP SP4 Unofficial installer is dedicated to Windows XP users who are not able, cannot afford or do not want to migrate to a newer Windows edition.

Please be advised that this package is not released by Microsoft, who does not recommend computer users to install it.

The package is compatible with 32-bit versions of Windows XP, with SP1 installed and it can be deployed on an installation media. Windows XP SP4 Unofficial comes to the rescue, providing XP users with the latest official XP updates alongside up-to-date components up to May 2014, also including POSReady updates. Thus, computers that are still stuck with this late OS version can become vulnerable to malicious attacks. Microsoft has ended the official support for Windows XP for a while now, which means that there are no more official security updates for users of the XP operating system and technical support is not provided anymore. I just found on Softpedia the latest Windows XP Unofficial update:

Windows xp service pack 4 64 bit