If you want to manually install Java rather than having the launcher do it for you, follow these steps. Download Java 8 x64 Windows/macOS Download from Oracle. For Windows: Windows x64 (jre-8uVERSION-windows-x64.exe) For macOS: Mac OS X x64 (jre-8uVERSION-macosx-x64.dmg) Linux: OpenJDK (recommended): $ sudo apt-get install openjdk-8-jre Oracle: Instructions Follow on-screen instructions. Try to launch the game again, the launcher should find the version you just installed. If it does not, try setting the value manually.