SharePoint Download Links at One Place

WSS2.0:

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Windows SharePoint Services 2.0 with Service Pack 2http://www.microsoft.com/downloads/details.aspx?FamilyId=B922B28D-806A-427B-A4C5-AB0F1AA0F7F9&displaylang=en

Windows SharePoint Services Service Pack 3 (SP3)http://www.microsoft.com/downloads/details.aspx?familyid=2BBFC89B-EB59-49FF-B58F-684693CB25A7&displaylang=en

Post SP3 hotfixes

http://support.microsoft.com/kb/941412

http://support.microsoft.com/kb/948919

http://support.microsoft.com/kb/950386

http://support.microsoft.com/kb/952903

http://support.microsoft.com/kb/958706

SPS2003:

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Microsoft Office SharePoint Portal Server 2003 - Evaluation Edition http://www.microsoft.com/downloads/details.aspx?FamilyID=16006564-4575-4463-920d-c920b4aeae64&DisplayLang=en

SharePoint Portal Server 2003 Service Pack 3 (SP3)http://www.microsoft.com/downloads/details.aspx?familyid=AB086D48-1148-48DE-B4EC-A6298367E5F0&displaylang=en

Description of the SharePoint Portal Server 2003 post-Service Pack 3 hotfix package: February 26, 2008http://support.microsoft.com/kb/943167

SharePoint Products and Technologies Utility: Upgrade Pre-scan Tool

http://www.microsoft.com/downloads/details.aspx?familyid=e8a00b1f-6f45-42cd-8e56-e62c20feb2f1&displaylang=en

WSS3.0:

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Download Windows SharePoint Services 3.0http://technet.microsoft.com/hi-in/windowsserver/sharepoint/bb400747(en-us).aspx

Windows SharePoint Services 3.0 Service Pack 1 (SP1)http://www.microsoft.com/downloads/details.aspx?familyid=4191A531-A2E9-45E4-B71E-5B0B17108BD2&displaylang=en

Description of the Windows SharePoint Services 3.0 post-Service Pack 1 hotfix package: January 31, 2008
http://support.microsoft.com/kb/941422

Description of the Infrastructure Update for Windows SharePoint Services 3.0: July 15, 2008http://support.microsoft.com/kb/951695

Description of the Windows SharePoint Services 3.0 hotfix package (Sts.msp): August 26, 2008http://support.microsoft.com/kb/956057

MOSS 2007:

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Microsoft Office SharePoint Server 2007 Trial Versionhttp://www.microsoft.com/downloads/details.aspx?FamilyID=2e6e5a9c-ebf6-4f7f-8467-f4de6bd6b831&displaylang=en

The 2007 Microsoft Office Servers Service Pack 1 (SP1)http://www.microsoft.com/downloads/details.aspx?FamilyID=ad59175c-ad6a-4027-8c2f-db25322f791b&displaylang=en

Description of the SharePoint Server 2007 and SharePoint Server 2007 for Search post-2007 Office servers Service Pack 1 hotfix package: January 31, 2008

http://support.microsoft.com/kb/941274

Description of the Microsoft Office Servers Infrastructure Update: July 15, 2008http://support.microsoft.com/kb/951297

Description of the SharePoint Server 2007 hotfix package (Coreserver.msp): August 26, 2008http://support.microsoft.com/kb/956056

.Net Framework:

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Microsoft .NET Framework Version 2.0 Redistributable Package (x86)http://www.microsoft.com/downloads/details.aspx?FamilyID=0856EACB-4362-4B0D-8EDD-AAB15C5E04F5&displaylang=en

Microsoft .NET Framework 2.0 Service Pack 1 (x86)http://www.microsoft.com/downloads/details.aspx?familyid=79BC3B77-E02C-4AD3-AACF-A7633F706BA5&displaylang=en

Microsoft .NET Framework 3.0 Redistributable Packagehttp://www.microsoft.com/downloads/details.aspx?familyid=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en

Microsoft .NET Framework 3.0 Service Pack 1http://www.microsoft.com/downloads/details.aspx?familyid=EC2CA85D-B255-4425-9E65-1E88A0BDB72A&displaylang=en

SQL Server:

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Microsoft SQL Server 2000 Service Pack 4http://www.microsoft.com/DOWNLOADS/details.aspx?familyid=8E2DFC8D-C20E-4446-99A9-B7F0213F8BC5&displaylang=en

Microsoft SQL Server 2005 Service Pack 2http://www.microsoft.com/downloads/details.aspx?familyid=D07219B2-1E23-49C8-8F0C-63FA18F26D3A&displaylang=en

Microsoft SQL Server 2005 Express Editionhttp://www.microsoft.com/downloads/details.aspx?familyid=220549b5-0b07-4448-8848-dcc397514b41&displaylang=en

Microsoft SQL Server Management Studio Expresshttp://www.microsoft.com/downloads/details.aspx?familyid=C243A5AE-4BD1-4E3D-94B8-5A0F62BF7796&displaylang=en

WINDOWS:

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Windows Server 2003 Service Pack 2 (32-bit x86)http://www.microsoft.com/downloads/details.aspx?FamilyId=95AC1610-C232-4644-B828-C55EEC605D55&displaylang=en

Windows Server 2003 Service Pack 2 for x64 Editionshttp://www.microsoft.com/downloads/details.aspx?familyid=08FEC2F5-6E3B-4E0D-9314-646414D0A421&displaylang=en

OTHER:

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SharePoint Designer 2007 Trial Versionhttp://www.microsoft.com/downloads/details.aspx?FamilyID=baa3ad86-bfc1-4bd4-9812-d9e710d44f42&DisplayLang=en

SharePoint Templateshttp://www.microsoft.com/sharepoint/templates.mspx

Diagnostic Tools:

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SharePoint Portal Server Support Report Tool (SPSReport)http://www.codeplex.com/spsreport

FileMon for Windows v7.04http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx

RegMon for Windows v7.04http://technet.microsoft.com/hi-in/sysinternals/bb896652(en-us).aspx

Process Monitor v2.03http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx

Microsoft Network Monitor 3.2http://www.microsoft.com/DownLoads/details.aspx?FamilyID=f4db40af-1e08-4a21-a26b-ec2f4dc4190d&displaylang=en

Disclaimer: Follow Official Documentation before Installation.