We have provided a child theme package ready for you to use if you wish to make changes to files while keeping them through updates.
The child theme is included within the main download folder, and is named “profix-child” all you need to do is upload this as well as the standard “profix” folder, and then activate the child theme in Appearance > Themes from the WordPress menu.
Note: To know more about the child themes follow http://codex.wordpress.org/Child_Themes