I'm sorry in anticipation if this is a stupid question, but, exactly what did you download? And what did you do with it?
I ask because, the full download is to be installed in a separate folder, BUT, the update download is to be extracted OVER the previous version, WITH Replacement.
If you are installing the full one OVER a previous version (0.20) it may cause issues.
If you are installing the Update only, on a new folder, it will not run correctly.
So, please tell us EXACTLY what you did, or, do what I just said.
Again sorry if you feel this is stupid, but since you are having problems I decided to ask.
Peace