I'm afraid using your older save files from 0.15 won't work here, unless perhaps you still got an older save file from before Pine Island. But even then I'm not sure if you might run into problems, since the Western Island also got some big changes since last time, like new chests in Rubyro's room, and you now require a special pick to mine rubies. TL;DR, the safest bet would be to use one of the prepackaged save files that come with update 0.16. If you already got rid of those, just download the game again. File 3 puts you right before you get back on the ship after you got the purple fruit, your characters are level 22 (you just gotta spend all your stat points), you got quite some gold and every item available in the game up to this point at least once in your inventory, so you can recreate your old character builds right away, and all the side quests, scenes, and easter eggs have also been unlocked in these save files, so you won't feel like you lost any progress. Yes, the main character is now called "Adventurer", but you can change his name at the ID machine in the Gloomy Forest, the one just before you enter the Bangers Club. The rest of the main quest line, heading to Maneland and finding Runt Whiner, aren't in the game yet.