As for working with legacy FE code base (AngularJs) there is almost always some need to use older node versions. Nice way for that is just install nvm, using directly from curl https://github.com/nvm-sh/nvm sometimes doesn't work. But installations using brew works like a charm.
Some information can be found here: https://michael-kuehnel.de/node.js/2015/09/08/using-vm-to-switch-node-versions.html