async upgradeSimple () {
    this.spinner = new Spinner(`${strings.startingUpgradeSimple} %s`)

    if (this.options.spinner === false) {
      console.log(strings.startingUpgradeSimple)
    } else {
      this.spinner.start()
    }

    const output = await powershell.runSimpleUpgrade(this.options.npmVersion)

    this.spinner.stop(false)
    console.log('\n')

    if (output.error) {
      throw output.error
    }
  }
Attempts a simple upgrade, eventually calling npm install -g npm

@param {string} version - Version that should be installed
@private