Below are the steps to upgrade the node version using NVM :

1. Open the console and type below command : nvm list

2. To install the <NODE_VERSION> version run the below command : nvm install <NODE_VERSION>

3. After the installation is complete it will add the node version in the nvm. To check the same type command : nvm list

4. To switch the Node version type the below command: nvm use <NODE_VERSION>

5. To verify the node version switch type the below command:
   node –v

For reference : https://www.erpluse.com/2018/11/nvm-installation-on-windows.html