In this case if you want to move to latest version of node, you need to again uninstall the legacy and install the latest version. The harder way is to uninstall the current node version (which is 10 in this case) and install the node version 6 and develop the enhancement build and package it. There are 2 ways to achieve it, the harder way and smarter way. You need to implement an enhancement for the solution developed in Node 6. Imagine you have developed an SPFx solution using node 6 and deployed the package in production. When working with SPFx, you may get into situation where the solution needs to be tested in Node LTS version (Long Term Support).

Same steps can be performed on windows 11 as well. This article contains installation instructions for windows 10. This way installing or uninstalling a particular node version will not disrupt the packages and runtime. NVM is the tool, that allows you to download and install multiple node versions and isolates the projects and packages without affecting their functionality. This tool is extended for Windows machines with lot of efforts and contribution from community. This tool is intially can only be used on Mac and Linux machines. Before starting with Node Version Manager aka NVM, a BIG THANKS to Corey Butler and Team, who made this cool product possible for windows users.

Install nvm windows