1. How can I update Visual Composer and Slider Revolution plugins?
You cannot update Visual Composer and Slider Revolution on your own, but we will provide you with a new update of the theme and with the updated versions of the plugins.
2. I have overwritten theme templates, will I lose my changes with a new update of the theme.
No, if you do not replace your files with the updated ones. However, this choice is all up to you, because an update of the theme might include bug fixes necessary for the theme to work always better.