OK, I just used winmerge to move my original 1.3.8a files (on the left of the winmerge interface) to the new 1.3.9 files (on the right of the winmerge interface) and it did the eaxct opposite - the original files were erased and the new files were placed in their stead. Fortunately, I have the original files on my server.
My assessment at this point is that there is no easy or reasonably safe way to upgrade Zen Cart without taking a day off of work to devote to the process.
Dr. Byte, you mentioned security problems with 1.3.8a. How serious are these? Considering the upgraded process, a few minor bugs might acceptable than destroying my site through an esoteric upgrade method if there are easier fixes.
Thanks!
T



