1. Install the required IntelliJ IDEA build (note installation intructions on IDEA EAP download page).
2. Install JDK 5.0.
3. Install JetBrains MPS.
2a 3a. On windows run installer.
2b 3b. On other system extract mspxxx.zip and set path to JDK in mps.sh located under %MPS_HOME%/bin directory.
3 4. Start JetBrains MPS. JetBrains MPS will ask you to install JetBrains MPS plugin.
4 5. Start IntelliJ IDEA.
5 6. Start JetBrains MPS.
You will probably want to try the MPS Hello World tutorial.