How do I revert back to a previous version of upfront?

Hi there,

I already have 2 posts going for issues I have related to the latest update of upfront/spirit... I am not getting a satisfactory solution and now when I double click to edit (let it be a simple text box or the text widget for example) I can't even edit.. nothing happens.. This is bad!!! so I would like to revert to a previous version of the theme... please advise on how.. I read on line I have to use ftp to replace the upfront folder but where do I get the previous version to download? I usually do it through the dashboard...