DaemonUmbra

Try Johann Löfflmann's JarFix utility.

That's not debug.log

I'm talking about a file that the installer generates next to itself

...what? You're supposed to get a URL back.

There should be an installer log in the same folder as the installer, it might have the same name as the installer or just be installer.log... please provide it

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

This is with the installer, correct?

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.8 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Known issue, not one we can currently fix. Need to wait for libraries to be updated to a change in the M1's graphics API.

I'm unable to replicate this issue on the version you indicated, however this was a known bug on some previous versions and has since been fixed. Are you sure you got the version correct?

Do you not see the public static fields in ForgeConfig that are holding the config instances, and the public fields in those config instances you can .get()?

What launcher are you using? Please provide a screenshot.

Look for the ForgeConfig class

Have you looked at how Forge does its configs?

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

.minecraft/config or wherever you set the Game Directory to be

You're better off rewriting the whole thing from scratch

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

The registry entries have nothing to do with the mod that adds this login screen Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)