Thanks so much for the video tutorial. I was able to get the pack to work. It seems to crash though if you don't extract the .zip first before putting it in the new folder.
Thanks for your help!
Edit: I've tried downloading other packs from that site and none of them have worked. I noticed they didn't have a resources.json to even give them proper names so I copied and edited the one from your included pack. I renamed the icons to match the naming scheme as well. They show up in the list but upon selecting them the game just uses the default texture packs. What am I missing? Did I do something wrong?