I have everything installed and created a profile in Minecraft with the version but if I start now the launcher will close but Minecraft will not start. It worked with the old LabyMod, but now it's no longer with the LabyMod 3. (Neither LabyMod 1.8.9 nor the 1.12.2
Did you try to raise Ram?
How does it work?
You are going to enable profiles on Advanced Settings will search the profile of Labymod activate JVM arguments,
and replaces the following -Xmx1G with -Xmx3G
Now you try to restart it
You probably have Labymod installed before Java. That's probably why you can't play.
Did you start the right Minecraft version before installing LabyMod? If not: remove LabyMod again, start the normal Mc version and then install LabyMod
I had Java installed before