error 404 installing node-sass --save-dev - node.js

im a new beginner in html/css development with windows 10. I'm trying to use Saas for my website project but when I am trying to install node-sass, I get the following errors:
PS C:\wamp64\www\flexbox> npm install node-saas --save-dev
npm ERR! code E404
npm ERR! 404 Not Found: node-saas#latest
npm version is : 6.3.0
node version is : 8.11.3
I've already try this: Unable to install node-sass in my project but it doesn't work.
I'v try to open cmd as administrator, and try executing the same commands. Same problem again...
Can you please help me to find a solution ? Thanks !

You're installing node-saas. You meant to install node-sass, double s and a single a.

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npm ERR! code ERR_OUT_OF_RANGE
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To prevent these issues, use nvm to manage your Node version:
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# Example: Selecting Node v13
# For complete list of available versions run `nvm ls-remote`
nvm install 13
nvm use 13
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