i have posted this here as i couldn't find any thing on this, so how to set a private variable
You mean an instance variable ?
Explain more ( There is no such thing in C2 )
i have seen it in many places written "private variable" but does instance variable change in different versions of the original pluggin
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Private Variables and Instance Variables are one in the same. You set them up in the object's properties after clicking on the object you want to add them to. This is by default on the left side of the screen.
You'd do well to go through the various tutorials packaged with Construct 2. They teach you almost everything you need to know.