Sorry about that, I'm pretty new to programming so I'm sure this is a bug. What OS are you on? I know there was an issue like this on Linux that I thought I had fixed, but it may have cropped up again unintentionally.
that's just a leftover from the reference I used when texturing the model, it shouldn't affect anything, the .png file in the download folder is the only needed texture. if it keeps giving you trouble, maybe try opening the .blend file and reexporting it out of blender
