No worries!
So, just so I think I got this right... You download the full version from Firestorm717's post, and installed that.
I'm sorry this is taking a while... Would you be able to make a backup of your save folder for a bit?
If possible, would you be able to uninstall Lamento, re-install it, DO NOT RUN ANY PATCHES AND DON'T PUT THE ENGLISH PATCH IN.
I want to see if saving/loading works for the base, vanilla Japanese install.
If even THAT isn't working, we'll have to look into other options. But if it DOES work, we can advance from there.
Sorry about that.