DaemonUmbra

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

Was the vanilla server open every time you tried to start Forge?

This sounds like a network issue, try again

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

It would just be another mod that your mods would need to depend on in mods.toml and that you would need to add to the workspace of your other mods through fg.deobf()

Details on debug.log can be found in my signature below, just expand the spoiler.

This looks like a vanilla crash log, have you tried going to Mojang?

I can't think of a reason the installer would quit without an indication of why

What version of Minecraft are you using?

Why did you bother censoring a method call? Also that is not the recommended way of setting properties, set them when you call the constructor, not in the constructor

What do you mean by "nothing"? Does it show a window that disappears immediately? Does it generate any files or folders?

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

Are there any hs_err_pidXXXXX files next to the installer?

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

Are you sure you got a 1.16.4 installer and not a 1.6.4 installer?

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.

Simply extracting a Curse modpack does not work. If you got the server version of the pack it might work but you're likely to be missing client-only stuff

Please don't necro ancient threads. If you have an issue please make your own thread.

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

Try removing your datapacks

Recycler is also throwing exceptions

Screenshots please?

Try removing Optifine

It means the mod file is either broken or not designed for the version you're using