OMAGYATT NEW UPDATE!!! Just a little question, do you need to delete the old file before downloading this.
Pretty sure if you just unzip it and and choose the file location as the old file, once it starts to unzip you have the options to replace the files or I think skip. Anyway just press replace files and then kaboom it should be done.
You can just replace them or keep them in the separate unzipped folder. I'd still recommend making a new save if you ever encountered a crash though.