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Microsoft has removed the download link for Windows 2000 Service Pack 4. Follow the archived link below to download it.
Direct download: https://web.archive.org/web/20051022095019/http://download.microsoft.com/download/e/6/a/e6a04295-d2a8-40d0-a0c5-241bfecd095e/w2ksp4_en.exe