It doesn't sound like there is going to be a final integration of these updates for SP5 with options for non-SSE, SSE1, or SSE2+. NET, then it is quick to install USP4 + GH0stPak-POS2009. But once you use GH0stPak for the POS2009 updates, it reverts back to 'Service Pack 3'

System Properties reports Service Pack 4. So far I haven't seen any Event Viewer errors using this. The documentation for the Unofficial XP Service Pack 4 claims it also includes important updates not part of WindowsUpdate. The file size is twice that of GH0stPak, so maybe it does. I'm not sure if the slipstreamed update rollup has the POS2009. NET (up to v4) and takes the whole day to install. But WindowsUpdate still has this, though it takes some 70 updates for all XP supported. The GH0stPak doesn't seem to include any of the. It is the GH0stPak that I installed after SP4. But somebody made an installer for live systems, GH0stPak. The Update rollup is for slipstreaming onto your XP installation media only. The update rollup through May 2019 includes the POS2009 updates. I think this means non-SSE CPUs should be OK. SP4 covers XP updates until its end of support.

I've tested out the non-slipstreamed varient.

Nobody here has used this service pack then?

Windows xp professional service pack 4