Service Pack 1 for Internet Explorer 6 can be downloaded from http://www.microsoft.com/windows/ie/downloads/critical/ie6sp1/default.asp.
You can view the fixes in Service Pack 1 for Internet Explorer 6 at Q326489.
If you wish to download the complete IE6 with integrated SP1, to apply to IE 4.0 - IE 6.0:
1. Create a Folder, C:\IE6SP1, on the download computer and possibly create a distribution share.
2. Download Service Pack 1 to C:\IE6SP1.
3. Run "C:\ie6SP1\ie6setup.exe" /c:"ie6wzd.exe /d /s:""#E"
4. Select all the appropriate operating systems that you require.
When you are finished, a client can install IE 6.0, integrated with SP1, by running IE6setup.exe from the c:\ie6SP1 folder.