So far the steps you gave me seemed to work. But I'm still having trouble, you see I've already finished editing the file and also converted it back to normal, after I replaced the "gamesave1.rjson" with the modified version then I launched the app and the game data remained the same.
Is there some kind of trick to fully load the modified data?
I really wanna know your method of modifying since I've purchased the paid version and if I can make this work, I don't need to go on so much trouble just to install a mod that my system keeps rejecting.