You're supposed to find the save you want to edit, make any changes that you want but don't save the changes yet, then you restart/start up Persona 4 Golden and go to the load screen, then you save the changes, and then you load the save. I got you homie.

When does this happen with your launcher? I'm not an expert or anything but more details might be helpful.

I've downloaded and installed all the prerequisites, .NET Core 3.1 x64 and x86, Visual C++ Redist 2015 x64 and x86, and updated my Windows installation from 1909 to 2004 after realizing it wasn't the latest update, but the Reloaded-II.exe doesn't do anything when I try to open it. Not entirely sure ...