For IntelliJ IDEA 5.x and later we are using NSIS installer on Windows platform.

NSIS installers recognize /S for silent installation, /NCRC to suppress the CRC (verification) step, and /D=dir to specify the "output directory", which is where the program will be installed.

These options are case-sensitive, so be sure to type them in upper case.

You can also wrap the already installed IntelliJ IDEA copy into any custom installer (IntelliJ IDEA doesn't require any registry settings to run).