Get the nwjs binaries from https://dl.nwjs.io/v0.26.6/ and extract them to the respective /apps folder.
For the first run, you'll need to install development dependencies by opening a shell windows, navigating to the project root and entering
npm install --dev. You only have to do this once.
For regular development, you'll open the shell, navigate to project root and enter
npm start to open the development app. Open another shell window, navigate to project root and enter
gulp. You're good to go!
When done developing enter
gulp dist to update the apps.