NVM (Node Version Manager)

I was trying to get a Tilestream server running tonight and I ran into a problem. It wanted an older version of node.

After a little looking around on how to run multiple versions of node on my system, I came across Node Version Manager (nvm)

You can install different versions of node, and then activate them as a specific version is needed.

It's very simple and the usage is documented on the project page.