You have to visit https://www.jetbrains.com/idea/download/, and download an intelliJ IDEA IDE, either Community or Ultimate will work. Community is free, but Ultimate has tons of additional features, and allows you to use it as a really polyglot IDE.
After installing and launching, you have to go to
Configure -> Plugins
Then click the
Then search for
Korgeand click the
Installgreen button. That will suggest you to restart the IDE. Do so.
After that, you should see the Korge menu when opening a project. Depending on the version you will see
Korgeit in the main menu or in the
Tools -> Korgemenu.
Korge will work on projects that include