How do i launch multiple instances of the same minecraft (different accounts)

[itsnotethann]

^

[ORelio]

Launch MinecraftClient.exe several times.
You can have the same config and pass the username as first argument.
Example script launch.bat that you can create with Notepad and rename from .txt to .bat:

@echo off
cd %~dp0
start /min MinecraftClient.exe user1
start /min MinecraftClient.exe user2
start /min MinecraftClient.exe user3

Define user1, user2, user3, etc in a file called accounts.txt set in config file:
https://github.com/ORelio/Minecraft-Console-Client/blob/f16e9e87dd82381514d5ea11300d88b4d47dfd25/MinecraftClient/Resources/config/MinecraftClient.ini#L36

user1,playerone@email.com,password1
user2,playertwo@email.com,password2
user3,playerthree@email.com,password3