Where is my old version Animate 20.0?

I could get old version animate like 20.0 about two months ago.

Unfortunately, higher version animate than 20.0 can not convert normally my flash to html5 canvas project. And also they're spent a lot of time for converting even didn't work.

So I need 20.0 version animate.

However, current Adobe Cloud give to me only one old version option.

How can I get animate 20.0 ?