What to Download

1. Download JetBrains MPS EAP (build #415) from:
http://download.jetbrains.com/mps/mps-eap-415-Jre.exe - windows version
http://download.jetbrains.com/mps/mps-eap-415.exe - windows version without JRE
http://download.jetbrains.com/mps/mps-eap-415-Mac.zip - mac os x version
http://download.jetbrains.com/mps/mps-eap-415-Generic.zip - generic version

2. JetBrains MPS contains IntelliJ IDEA plugin and you need IntelliJ IDEA Selena to work with JetBrains MPS. Download the required IntelliJ IDEA build from:
IntelliJ IDEA Selena

How to Get Started

1. Install the required IntelliJ IDEA build.
2. Install JDK 5.0.
3. Install JetBrains MPS.
3a. On windows run installer.
3b. On other system extract mpsXXX.zip and use a command java -jar ./lib/mps.jar
4. Start JetBrains MPS. JetBrains MPS will ask you to install JetBrains MPS plugin.
5. Start IntelliJ IDEA.

Additional Information