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Microsoft has removed the download link for Windows 2000 Service Pack 4 Roll Up. Follow the archived link below to download it.
Direct download: https://web.archive.org/web/20060320020710/http://download.microsoft.com/download/2/7/b/27b1d1a3-0299-4336-b88a-22b9f09817e2/Windows2000-KB891861-v2-x86-ENU.EXE