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Therefore, Windows Installer 4.5 does not apply to these operating systems.Īdditionally, there is no redistributable for Windows Installer 5.0. Important Windows Installer 5.0 is released with the following operating systems. Windows Installer 4.5 is released with Windows Vista Service Pack 2 (SP2) and Windows Server 2008 SP2.Īnd Windows Installer 4.5 is released as a redistributable for the following operating systems: Software manufacturers can create the setup of their products to use Windows Installer to help make software installation, maintenance, and uninstallation straightforward and easy. Windows Installer provides a standard foundation for installing and uninstalling software. In other words, download at your own risk, and gird yourself with extra protection measures if you’re going to be an XP holdout.Microsoft Windows Installer is a component of the Windows operating system. Still, we are talking about an unofficial update from an obscure source, with limited time and resources for testing across a broad range of machines. The first part of that statement still rings true, but the whole point of the unofficial service pack is to test the fixes against Windows XP and ensure they work properly. “Windows XP customers also run a significant risk of functionality issues with their machines if they install these updates, as they are not tested against Windows XP.” “The security updates that could be installed are intended for Windows Embedded and Windows Server 2003 customers and do not fully protect Windows XP customers,” the company said in May. Of course, Microsoft advises against Windows XP users installing these fixes, and suggests updating to Windows 7 or Windows 8 instead. As discovered in May, it’s possible to keep getting these security updates through a registry hack, but Unofficial SP4 enables this hack by default and bakes in all of its previous fixes. More importantly, Service Pack 4 includes additional security fixes that aren’t technically part of Windows XP proper, but are instead intended for ATMs and point of sale machines still running a variant of the aging OS. Further reading: Windows XP survival guide: How to upgrade (or not)