Click on Run as Administrator, you can see this option on the right or right-click on the icon and select it from the dropdown. Run it as Administrator: Press the Windows button on your keyboard.If this means nothing to you, you can safely ignore these options. The commands have to finish running for the instance start/exit to proceed. INST_JAVA_ARGS - command-line parameters used for launch.INST_JAVA - java binary used for launch.INST_MC_DIR - absolute path of Minecraft.INST_DIR - absolute path of the instance.Pre-launch command runs before the instance launches and post-exit command runs after it exits.īoth will be run in MultiMC's working directory with extra environment variables: The console is however always accessible - you can find it as a tray icon that appears when you start an instance, even with these options disabled. If you want to watch the game start up or are trying to fix some mod problem, it's a good idea to enable the console and not let it close on game exit. The maximize option only works for legacy versions (1.5.2 and older). Lets you override the Minecraft window size. Advice about what is to be put here pops up on internet discussion forums, but most of the time, its effects are negligible or even harmful. If you know what you are doing, you can add some here. MultiMC generally adds most of the relevant JVM arguments itself, without any need for adding more. With 32bit java, the maximum is around 1500MB. You might want to set the numbers higher (about double the default sizes is generally OK). The MultiMC default memory settings are suitable for lightly modded instances or vanilla Minecraft. If you use integrated intel graphics on Windows, make sure to select the javaw.exe executable, not java.exe! Memory settings Here, you can either directly insert the java runtime you want to use, let MultiMC detect it automatically (probably the best option), look for it using a file browser and test the currently selected one. The settings are divided in sections, each with a checkbox, which enables the override.

The instance settings allow you to override the global MultiMC settings for a particular instance.

Minecraft launcher launch option icons