The developer has already said earlier that 1.03 save files are not compatible with 1.04 so there's nothing really to fix here. While they could release a new 1.05 version they would have to build backward compatibility with the old 1.03 and 1.04 files and that's a bunch of work for no payback, other than providing that option to people that need it. A lot to ask for a free game that's only a few months old since development started.