How to downgrade Node version

Warning: This answer does not support Windows OS

You can use n for node's version management. There is a simple intro for n.

$ npm install -g n
$ n 6.10.3

this is very easy to use.

then you can show your node version:

$ node -v
v6.10.3

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For windows nvm is a well-received tool.

For windows:

Steps

1. Go to Control panel> program and features>Node.js then uninstall

2. Go to website: https://nodejs.org/en/ and download the version and install.