From an article over at Exuberant Software http://exuberant.ms11.net/98sesp.html:
"UNOFFICIAL Windows98 Second Edition Service Pack 1.6.2
Microsoft has never released a service pack for Windows98 SE. But I made a ServicePack for Windows98 SE users. It contains all Windows98 SE updates fromWindows Update site and more.
It is a self-extracting and self-installing pack like Microsoft's update files.Thus, you can not choose files individually. However, the pack installs only required fixes for your system. Uninstallation is possible from Add-Remove Programs.
This is only for WINDOWS 98 SECOND EDITION ENGLISH.
I highly recommend that you should backup your system before installing the pack. You must have at least 32 MB
It contains only operating system updates. It does NOT contain Internet Explorer6, DirectX 9, Media Player 9 and their updates."
See their website for more details ....