Miscrosoft Visual C++ v6.0 SP5 is the compiler you need to create scripts. It cannot be downloaded, unfortunately. Also, this version has been replaced by a later version of Visual Studio, and the later version is not (as far as I know) compatible with the SFC API.
There are still some copies floating around on eBay, or perhaps if you know someone who can lend you a copy, but basically it isnt free and is no longer being produced. All the Taldren scripts have source code which is readily available and used to be downloadable from Taldren, I'm not sure if anyine else is currently hosting it.