I unfortunately have some issues with extracting the .pck file in particular. I've done about 2 minutes of looking into it and found people tend to have similar issues when extracting items in a .rar archive on my OS. Could you maybe do a .zip or .tar.gz instead?
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Isaac, as I can not change the file I put a zip file on Mega-upload. hope this will work. after the jam I will change the file if this is working.
https://mega.nz/file/6WgDkbSQ#yxB28KbQGEp8YdaaPrBTtaXVGBd_2nYOHRsorb0jR2g