Right now, the script would overwrite the existing files. I should add -n to the copy command so it doesn't overwrite.
Telling the script to add something to the fold name if the folder already exists would be easy.
This is something I have never had to deal with. I always know if I have duplicate mag names and deal with that before I ever download the mag. I would prefer the script to error out and leave me to fix the problem than do something automatically. Thats just me though.
When I get some free time, I will look into this.