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Updates & Service Packs for Windows NT 3.1, 3.5, 3.51, and 4.0.
Windows NT service packs are cumulative but the Security Rollup Package is not. Apply first SP6a then the SRP to be fully up to date. All links are 128bit (High) encryption, US English. Windows NT 4.0 supported multiple CPU Architectures (x86, Alpha, MIPS and PowerPC) - choose the appropriate architecture for your PC. These updates do not apply to Windows NT 4.0 Terminal Server Edition.
| Service Pack | Date | Link | Notes |
| Security Rollup Package (SRP) | 26 July 2001 | x86 | Apply after SP6a. Its possible no Alpha version of this was publicly released. |
| Service Pack 6a (SP6a) | 22 November 1999 | x86, Alpha | |
| Service Pack 6 (SP6) | 27 October 1999 | x86, Alpha | This update is currently missing |
| Service Pack 5 (SP5) | 4 May 1999 | x86, Alpha | This update is currently missing |
| Service Pack 4 (SP4) | 25 October 1998 | x86, Alpha (ISO) | |
| Service Pack 3 (SP3) | 15 May 1997 | x86, Alpha (on the Option Pack CD-ROM) | |
| Service Pack 2 (SP2) | 14 December 1996 | x86, Alpha, PowerPC | Final service pack for PowerPC |
| Service Pack 1 (SP1) | 16 October 1996 | x86, Alpha, MIPS, PowerPC | Final service pack for MIPS |
Updates for Windows NT 4.0 are, for the most part, incompatible with Windows NT 4.0 Terminal Server Edition. This edition received its own service packs and other updates, usually a couple of months after the workstation and server editions. Only Service Packs 4, 5, 6 and the SRP were released; the CD-ROM is already at the Service Pack 3 level.
| Service Pack | Date | Link | Notes |
| Service Pack 4 | April 1999 | x86, alpha | This update is currently missing. |
| Service pack 5 | ? | x86, alpha | This appears to be the final service pack for Alpha. |
| Service Pack 6 | 14 April 2000 | x86 | There was no SP6a for Terminal Server Edition. |
| Security Rollup Package | 15 April 2002 | x86 |
Windows NT Service Packs are cumulative - you only need to apply the most recent (Service Pack 5). Earlier service packs can be ignored unless you have a specific need. Windows NT 3.51 supported multiple CPU Architectures (x86, Alpha, MIPS and PowerPC) - choose the appropriate architecture for your PC. All service packs are distributed as self-extracting archives. Run with SPx_351y.EXE -d <path> to extract where x is the Service pack number (1,2,3,4,5) and y is your CPU Architecture (I, A, M or P).
| Service Pack | Date | Link | Notes |
| Post-SP5 Hotfixes | Browse | Hotfixes released after Service Pack 5. | |
| Service Pack 5 (SP5) | x86, Alpha, MIPS, PowerPC, Readme | Final service pack for NT 3.51 | |
| Service Pack 4 (SP4) | x86, MIPS, PowerPC, Readme | This update is currently missing for the Alpha CPU Architecture (file should be SP4_351A.EXE). | |
| Service Pack 3 (SP3) | x86 Readme | This update is currently missing for the Alpha, MIPS and PowerPC CPU Architectures (files should be SP3_351A.EXE, SP3_351M.EXE, SP3_351P.EXE). | |
| Service Pack 2 (SP2) | x86, Readme | This update is currently missing for the Alpha, MIPS and PowerPC CPU Architectures (files should be SP2_351A.EXE, SP2_351M.EXE, SP2_351P.EXE). | |
| Service Pack 1 (SP1) | This update is currently missing. |
Windows NT Service Packs are cumulative - you only need to apply the most recent (Service Pack 3). Earlier service packs can be ignored unless you have a specific need. Windows NT 3.50 supported multiple CPU Architectures (x86, Alpha, and MIPS) - choose the appropriate architecture for your PC. All service packs are distributed as self-extracting archives. Run with SPx_35y.EXE -d <path> to extract where x is the Service pack number (1,2,3) and y is your CPU Architecture (I, A, or M).
| Service Pack | Date | Link | Notes |
| Service Pack 3 (SP3) | x86, Readme | This update is currently missing for the Alpha, and MIPS CPU Architectures (files should be SP3_35A.EXE and SP3_35M.EXE). | |
| Service Pack 2 (SP2) | This update is currently missing. | ||
| Service Pack 1 (SP1) | This update is currently missing. |
Windows NT Service Packs are cumulative - you only need to apply the most recent (Service Pack 3). Earlier service packs can be ignored unless you have a specific need. Windows NT 3.1 supported multiple CPU Architectures (x86, Alpha, and MIPS) - choose the appropriate architecture for your PC. All service packs are distributed as self-extracting archives. Run with -d <path> to extract.
| Service Pack | Date | Link | Notes |
| Service Pack 3 (SP3) | x86, in 20 parts (floppy disk install): 31, 32, 33, 34, 35, 36, 37, 38, 39, 51, 52, 53, 54, 55, 56, 57, 58, 59, 5A, 5B, | The download version of update is currently missing for the Alpha and MIPS CPU Architectures. It can, however, be found on some Microsoft Developer Network CDs, such as this one (under /NTSRVPC3/USA/). | |
| Service Pack 2 (SP2) | This update is currently missing. | ||
| Service Pack 1 (SP1) | This update is currently missing. |