The folder Files Safe is where you will copy the files ACA.msi and setup.ini from folder ACA2008 to for safe keeping. Both files are right up front, not buried in any folders. Just scroll down until you find ACA, and then not far below that is setup.ini. That file is right underneath setup.exe. Make sure that you copy the right file.
The folder Files Copy is where you will download the new ACA.msi and setup.ini files to. Now, here's where you get those files: Just click on the green text that says, 'DOWNLOAD THIS TORRENT'.
As soon as you download this file, Bit Torrent will automatically load and begin unpackaging it. When the file is 100% completed, click on the 'files' tab at the bottom of Bit Torrent where you will see the file you downloaded as a.rar file. Double click on that file. WinRAR will appear with the unzipped file.