Same way you do it with any other script in Unity.
Right click on the source component, Copy. Right click on the target component, Paste. Or right click on transform, paste values / paste as new.
Bounce logic is kept in there for backwards compatibility, but you can still use it if you wish. Open UITweenerEditor.cs, and uncomment lines 31 and 50.
In the future, just examine the code. I provide it for a reason, and I rarely remove something without an easy way of adding it back in for those that still need it.