Download Location: SSP-Platform-1-2-1.zip ("SSP Platform" is a portal application which acts container for SSP itself. The two applications are versioned independently. By default, version 1.2.0 1 of SSP Platform will include version 2.0.1 of SSP.)
Unzip the file into a suitable path (e.g. on Windows C:\ssp\platform-src or on Unix/Linux/Mac /usr/local/ssp/platform-src)