This is not the first example of the developer community pulling together Microsoft updates into a collective package, and it probably won't be the last. We've seen many times before how even small glitches can create huge problems when installing Windows updates and patches - sometimes requiring Microsoft to temporarily pull them to investigate the issues further. Needless to say, Microsoft won't be supporting Unofficial Service Pack 4 in any capacity, and users who choose to install it on their systems will be doing so at their own risk. Ability to scan for new updates (using the Windows Embedded POSReady 'trick', which Microsoft advised against using).

NET Framework 1.1, 3.5 and 4.0 up to May 2014 NET Frameworks 4.0, 3.5, 1.1 and 1.0 (Tablet PC only) Most Windows XP components, including Media Center Edition and Tablet PC.It can be applied to a live Windows XP system with SP1, at minimum, installed or it can be slipstreamed (integrated) in any Windows XP installation media.' The package includes: In a forum post, harkaz explained that Unofficial SP4 is 'a cumulative update rollup for Windows XP (x86). 'For this reason, I started working on a Service Pack 4 package.' 'Many users - including me - who won't be able to upgrade their old machines to a new OS would like to easily install all Windows updates in one convenient package,' harkaz said.

Windows xp service pack 4