Hello Javier,
S32 SDK v0.8.1(EAR) is available as a part of S32DS installer. You can download it here:
http://cache.nxp.com/files/software_development_tools/ide-debug/S32DS-ARM.html
after the installation you can find SDK folder here:
c:\Freescale\S32_ARM_v1.2\S32DS\S32_SDK_EAR_0.8.1
If you'd like to develop your project in Eclipse environment + IAR build tools you can use S32DS + IAR Eclipse Plug-in. S32DS also includes graphical configuration tool (Processor Expert UI) to generate your configuration.
Hope it helps.
Stan