Just so you know, downloading a new version of toribash doesn't overwrite the old version(s).
The easiest way of doing what you're asking for would be going into your Toribash directory and pulling out the replays folder, placing it somewhere else (i.e. desktop), in which you can then delete Toribash to download the new version.
In other words, go to: My Computer << Local Disk (C:) << Games << Toribash v.## << right-click the folder named 'replay', Copy, place it on your desktop (or wherever else you feel comfortable), download the new version, drag the 'replay' folder back into the Toribash directory of the new version.