Is there anyone know how to upgrade Magento 2.0.2 to 2.0.4?
Please give me some ideas!
You can visit this tutorial to upgrade Magento 2.0.2 to Magento 2.0.4
Hope that it is useful for you!
I used this tool to upgrade my Magento http://tinyurl.com/zeqk3ue . It works so well. Highly recommend.