This client is too godly for me to be honest, with so many unique features WITHOUT paying it is literally the best, First of all run this with a virus scanner or antivirus, when this was first leaked there was a virus imported into it so you have to fix that which is really simple just scan the file and fix it.
#1 Install Forge version 1558
#2 Import mods into the mods folder (ones you want to use with it)
3# Run Minecraft
4# Open Kurium Launcher
op auto clicker