npm i -g nwjs
usage
# Install a version
$ nw install 0.12.3
# Install a SDK version
$ nw install 0.13.0-rc3-sdk
# Run nw in cwd or specific any directory
$ nw .
# Use another cached version
$ nw use 0.13.0-beta3
# Use SDK version
$ nw use 0.13.0-rc3-sdk
# List all local cached versions
$ nw ls