Thank you for letting me know of this.
So, it seems some people are having trouble with this as well.
I don't know what's happening, but I'll give same tips as to others: 1. Check if the executable has the same name as the .pck file. 2. Try re-downloading and extracting the files again. 3. Maybe the download went wrong and the file is corrupted (although I don't think it happened).
I don't know if it was useful, but good luck anyaways!