The question is much too broad to answer. Please give us details of the method you are following and any error messages that you see.
Downloading from where? Your Creative Cloud Desktop app?
Or do you have some other link you're attempting to use?
Which version of Dreamweaver are you trying to download? Where are you downloading it from? What happens when you download - do you receive any error message?
Provide as many details here so that we can help you well.