I'm using an old save.
Wanted my strong character to explore the new dungeons
I do understand your side, but I have to say that I advise that you start a new character. Not only a lot of things are rebalanced and added to the shop only in a new save, but for now old saves will break things inside the game and make some features inaccessible. I'm currently working on an internal save tool to allow players to keep saves between major versions, but for now old saves are certain to break stuff.