Me hice examen de casa y tengo 2 problemas. (ventanas)

1. Cuando ejecuto nvm use 12.7 en Powershell, recibo este mensaje:

 nvm : The term 'nvm' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1 + nvm use 12.7 + ~~~ + CategoryInfo : ObjectNotFound: (nvm:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException

2. Cuando ejecuto npm install :

 lerna ERR! npm install exited 1 in '@ans-exam/client' npm ERR! answers-entry-level-exam@1.0.0 bootstrap: `lerna bootstrap`

He instalado nvm, npm y node.