While I was testing different Editors for AngularJS, Sublime caused me trouble with adding extra packages via package control. Whatever I did it threw 403,
Package Control: Error downloading channel. HTTP error 403 downloading https://packagecontrol.io/channel_v3.json.
After a little research I was able to figure out that error is due to network proxy limitations and fix for that is to add following proxy settings in Package Control.sublime-settings
"http_proxy": " xxx.xx.xxx.xx:8080",
"user_agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36"
Don't forget to add User-Agent because for me it did not work without it.
finially it worked for me... 🙂 let me know if it works for you too