Difference between antlr4-tools and installation

I'm starting gettting my hands dirty with antlr4 and I don't unserstand the difference between Getting started the easy way using antlr4-tools and Installation decribed in the Getting started guide.

• Can I choose either one?
• Does antlr4 (easy start) correspond to antlr4 alias (installation)?
• Does antlr4-parse (easy start) correspond to grun alias (installation)?

All of your 3 questions can be answered with a sound "yes" :)

There are (most probably) 2 versions because some people might not have Python installed on their machine.