run this command line on putty :
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.32.0/install.sh | bash
if you not get error in the last command, run this command
to test if installed correctly, run this command,
you must get 0.32.0,
if you got command not found, so you miss something, or that your configuration is different from mine, but it must work in most cases.