Ken,
I guess KC pulled the plug entirely on 2.5 and removed it from his site. I went and checked and it is not to be found (at least not in the download sections). Unless you are stuck using 2.5 for some reason, you may want to consider dropping to 2.1, or going up to Vixen+
If you are stuck using 2.5 for some reason and need to download, my guess is you will have to ask here or on diyc for a user on the forum to send you the zipped file. That is all I can offer you. I never went to 2.5 so I can't even help you by sending it to you. Good luck
Steve