1. Go to https://nodejs.org/en/download/releases/ and Choose your prefered version

2. Right click on node-vxx.xx.x-linux-x64.tar.gz and copy the link. Make sure the extention is tar.gz
   

3. Open terminal and type wget <url that you've copied>
   It will download NodeJs tarball into your system.
   

4. After completion of download, run this command
   

sudo tar -C /usr/local --strip-components 1 -xzf node-vxx.xx.x-linux-x64.tar.gz

Replace 'x' with your downloaded package's version

Now run node -v
if it show your desired version then congratulations.