if you download and unzip
https://downloads.raspberrypi.org/raspbian_latest
already you know it is not a ISO but a .img file.
from RPI could use dd instead of these image writers like etcher

To enable Blynk auto restart for Pi, find /etc/rc.local file and add there:
node full_path_to_your_script.js <Auth Token>
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[Desktop Entry]
Type=Application
Name=myautostart
Exec=lxterminal
Icon=gksu-root-terminal.png
Comment=myautostart of terminal
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node -v
npm -v
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.4/install.sh | bash
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nvm install node
node -v
npm -v