Step 3: Launch this instance once to ensure that the files are downloaded. If you don't remember which version it was, please refer to the table above. Step 2: From the “Vanilla” tab, select the exact Minecraft version that you saw in the error message. Step 1: Open MultiMC and press “Add Instance”. For the sake of simplicity, I will refer to all of these launchers as “MultiMC” in this section. Since PolyMC and Prism Launcher are forks of MultiMC, the steps to fix this error are the same for all of them. This time, it should have no trouble finding the Minecraft version that you just downloaded. Step 6: Now, simply run the Wurst installer again. Once the download is complete, feel free to close Minecraft and delete your “”. Step 5: You are now downloading Minecraft through the launcher. You now understand the non-existent “risks” and can check that box to get rid of the warning. They do not increase your safety in any way whatsoever. These so-called “player safety features” are parental controls, which allow your parents to lock you out of the game.

Step 4: If you are prompted with a “safety warning”, you can safely ignore that nonsense and just click the “Play” button again. Step 3: Launch your new installation by clicking “Play”. IMPORTANT: Select exactly the same version that is specified in the error message! If you don't remember which version it was, please refer to the table above. Then save the profile by clicking “Create”. Step 2: Now that you are in the “Create new installation” screen, set the “VERSION” field to the exact Minecraft version that you saw in the error message. The default value for xmx is 256MB, if you encounter a you may need to increase xmx when you start it with this command line.Step 1: Open the Minecraft launcher, select the “Installations” tab and then press “New”. You can change the size (the 500M and 1G parts) to whatever you like. You can specify the initial and maximum memory allocation pool for the Java Virtual Machine by adding -Xms500M and -Xmx1G between java and -jar.You can add no gui to the end of the command to open the server without the GUI.Then type in java -jar minecraft_server.jar and then change directories to where the Minecraft server jar is located with the cd command. Open the Terminal: Applcations > Accessories > Terminal. Now just type in java -jar minecraft_server1.8.8.jar and hit Enter to open the file. This will open cmd.exe with the location set to the correct spot, otherwise you could change directory with the cd (directory) command. Then push alt+ D type in cmd and hit Enter.

Can't open minecraft with jar launcher