For me the link to download the save game hack seems to be broken. I can't find a download of non-bloatware after following the link. This is where I end up:
https://iosddl.net/1ab6146e4e1397d6/Great_Royale.rar
Edit: The link allowed me to download the .rar file(it was difficult to see on the page). However it only contained a preferences folder; nothing for documents or library.
Final edit:
I got it to work but it was a little different from the Bowmasters save game hack process I was following. The downloaded "preferences" .rar file has to be copied to replace the "preferences" file in your original backed up save file. To do that you need to replace it under container>library>preferences. Hopefully this helps anyone else who is having the same problem.