Download a zip of the 64-bit Windows binary https://nodejs.org/dist/v14.16.0/node-v14.16.0-win-x64.zip
Extract to your user folder such as: C:\Users\Amit
Now create a file with name: nodev14.cmd
with below content
ECHO OFF
set PATH=%PATH%;C:\Users\Amit\node\v14\
ECHO ON
Now open command prompt and run below command to start using node v14.
nodev14
Note: The above command will work only when your command prompt is inside Users folder.