Arqade is a question and answer site for passionate videogamers on all platforms. I'm using forge version 10. Download and run the installer, which reports successful installation. I start MC and select the forge profile and try to run the game, and then nothing. The MC launcher just closes. No errors, no crash reports. It just instantly closes. Using win7, latest Java version, a brand new Minecraft install with NO mods yet installed. If this question can be reworded to fit the rules in theplease. Try using Java 7 can be installed alongside java 8 or for Forge. Older versions of forge have a bug that causes them to crash with Java 8 update 20 or higher. Report back if this works, and I'll make it an answer. We only provide tech support for vanilla Minecraft. While this has been fixed in later versions of Forge, it still affects all versions for Minecraft 1. One solution is to simply install Java 7 alongside Java 8 and correspondingly setting the correct Java path in the Profile Settings in the Minecraft Launcher. You can still use Java 8 for everything else. Alternatively, Minecraft Forum User for older Forge Versions that fixes the issue, by replacing the faulty class file inside the. Download links for the patched classes for 1.