Download Windows NT 4.0 SP6a

Where can I download Windows NT 4.0 Service Pack 6a?

Windows NT 4.0 Service Pack 6a (SP6a) resolves the SP6 issue with Lotus Notes and other Winsock based applications and provides the latest updates to Microsoft Windows NT Workstation 4.0 and Windows NT Server 4.0 (including Enterprise Edition). Windows NT 4.0 SP6a contains known Year 2000 updates for Windows NT 4.0. These Year 2000 updates are also available as separate Web downloads that you can apply to a Windows NT 4.0 Service Pack 4 system.

Download page:

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Windows NT 4.0 Service Pack 6a

  • High Encryption version for the Intel (x86) platform This version provides 128-bit encryption capabilities for computers running on the Intel (x86) platform. The High Encryption version of Windows NT 4.0 SP6a is eligible for export from the U.S. to all customers worldwide, except to U.S. embargoed destinations.

Note for Hebrew Enabled users: Do NOT install this version of SP6a on your system!!!

  • Standard Encryption version for the Intel (x86) platform Available to all customers, this version provides standard encryption capabilities for computers running on the Intel (x86) platform.

    Note for Hebrew Enabled users: Please make sure you select HEBREW from the drop down list of available languages!

There are two ways to install Windows NT 4.0 SP6a: Network installation, and Express installation:

  • Express:

1.6 MB-34.5 MB (Initial download of 280kb)

Fastest way to install SP6a, for single computer installation only, for computers running Internet Explorer 3.02 or later.

  • Network:


Required for multiple-computer installation, required for versions of Internet Explorer earlier than Internet Explorer 3.02, and all other browsers.


Windows NT 4.0 Service Pack 6a

Windows NT 4.0 Downloads page

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