Currently I am using Node.js v0.6.16 on Mac OS X 10.7.4. Now I want to upgrade it to the latest Node.js v0.8.1. But after downloading and installing the latest package file from nodejs.org, I found that system is still using v0.6.16 instead of v0.8.1 when I typed "node -v" in a terminal. Is there any step that I have missed? Or, should I thoroughly uninstall the old version before installing the latest one?

BTW, I know that nvm can help to manage the nodejs package

https://github.com/creationix/nvm/

Is there any way to upgrade the Node.js without using it?

I have googled this problem, but it seems to me that there is no very clear answer to this question for the latest Node.js.