adobe animate version 18 not support version 20?

hi,

I did my project on animate 20.5.1 using air ios 33.1.1.259.  but on animate 18.0.2  using again 33.1.1.259, I can not test my project or publish. All the movieclips that is added from library gives errors with all properties.  I did not understand. I only change path of .ane  files when I open it with older animate. I want to update my version 18, but now I can not do thar because I use windows 8.

image_holder.addChild( l );

image_holder.removeChild( _bitmap );

image_holder.x

image_holder.scaleX *= e.scaleX;
image_holder.scaleY *= e.scaleY;

camera_roll_btn.addEventListener(MouseEvent.CLICK, initCameraRoll);