For Ava 1.0 User:
Ava using Blender rigify function, so you just need to click "Reload Trusted" at the top of Blender Window bar when you open the file, or,
go to "User Preference > File" and click "Auto Run Python Scripts" so you don't need to click "Reload Trusted" everytime you open the file.
For Ava 1.5 User:
Extract "textures_1.5.zip" to "textures" folder