Okay, that's the problem. The problem is I'm an idiot and forgot to upload the sticker sheet as well - the presets need the sticker to work. I'm going to go hide in a corner now
Here, install this to your stickers, THEN add the preset and it should work.
Fish.stk
Hannah the .stk file is uploaded in your original post, unless you just did that. The preset works for me though I just noticed that the thumbnail for all of my presets is the symbol for my Parallels software to run Windows on my Mac. They work fine so I never noticed it before.
I just did that (to avoid confusing latecomers)
Ah, Windows. Sometimes it gets very confused about which files go with which programs. If you care, you can go to right click > Properties and change the 'Opens with' program to ArtRage. This will update the icon so at least you know which program they belong to.
Okay, the most likely answer is that your computer is cursed I blame Tycho.
Restarting ArtRage after adding the .stk should update things so that the preset is now pointing at something that actually exists, and it works fine for me here when I try it. If that's not working, you can just resave the preset (load it, change the sheet, save as a new preset) and you will have a new working preset going forward.