Microsoft has never released a service pack for Windows 98 SE. This contains all updates from Windows Update site and more. It is a self-extracting and self-installing pack. It contains only operating system updates not Internet Explorer, DirectX, Media Player or their updates.
OS: Windows 95/98/98SE
Free Download Link: Unofficial Windows 98 SE Service Pack 2.1a
OS: Windows 95/98/98SE
Free Download Link: Unofficial Windows 98 SE Service Pack 2.1a