SQL Server 2005 Books Online (April 2006) - 121 MB
If you have an existing, older, version of SQL Server 2005 Books Online installed you will be prompted to upgrade the current installation. Once the installation completes you should be able tell you've got the new version because the title bar will include the April 2006 date.
Also, there is a warning on the download page you should heed if you're running a beta or CTP version of Visual Studio .NET 2005, .NET Framework 2.0, SQL Server 2005, or SQL Server 2005 Books Online. Here's what it says:
Warning: Do not install this version of the SQL Server 2005 Books Online on a computer running the following:
Remove these versions from your system before installing SQL Server 2005 Books Online (April 2006).
- Any pre-release versions of Visual Studio 2005 or the .NET Framework 2.0.
- Any SQL Server 2005 Beta release.
- The SQL Server 2005 Community Technology Preview (CTP) June 2005 release.
- The SQL Server 2005 CTP September 2005 release.