WiX: Where can I download the bootstrapper?

I'm running Visual Studio 2008 SP1, and I'm getting the following error when trying to compile my WiX projct:

Could not find required file 'setup.bin' in 'C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bootst开发者_StackOverflow社区rapper\Engine

I've got Windows Installer 3.0 and the Windows Platform SDK installed. I've got a Microsoft SDKs\Windows\v6.0A directory, but there is no Boostrapper directory. Where can I get this?

Which Windows SDK do you have installed? I installed this one a few months back and it included the bootstrapper