Versions

TouchScript was originally developed in ActionScript 3 for Flash, rewritten from scratch in C# for Unity and at the moment Unity branch is where most of the development takes place. AS3 version of TouchScript is much behind but is used as a way to integrate Scaleform as a touch layer.

• Read more about layers,
• Read more about Scaleform.

Version numbers

Major version number means API compatibility, minor version number is just an update number in current API compatible version. In other words, your project will break if you go from version 4.x to version 5.0. Your project will not (most likely) break if you upgrade from 4.0 to 4.1.

But anyway make sure to back up your data and every new project check for an update.