Minecraft crashes when an automatic launcher updated

I have 3.91 RAM available
MC uses 1 of the ram

• An automatic installer for minecraft launcher popped up, and when I clicked to open minecraft, the screen looked different. Then I went into multiplayer and moments later my minecraft crashed saying there was an unexpected error that forced mc to crash. I tried rebooting minecraft and uninstalling/reinstalling. I don't know how to revise the old minecraft launcher. I use labymod and optifine