DaemonUmbra

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.

Don't install Forge manually. Don't necropost. Make your own thread.

The filenames of one or more of your mods suggests you got them from a repost site. Please read up on the StopModReposts project (link in my signature) for info on why this is a bad thing.

Your friend needs to clean out his mods folder for a start, there's several old mods here

There are many things that could cause that issue, not all of them are easy to fix.

You've only provided logs showing Optifine installed.

1.8 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.

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.

Don't bump. Also try removing Optifine

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

This is not a Forge issue

MCP is dead and was only used for versions that are absolutely ANCIENT now. Also, please don't necropost.

Then I can only recommend my video on bypassing Twitch for launching packs, this is a Twitch issue and not a Forge issue.

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

Try repairing the instance, otherwise there is a video in my signature about how to run a Twitch modpack without using Twitch

I know it's probably not what you want to hear but try reinstalling them

Make sure your drivers are up to date

Do you have a graphics card or do you use intel integrated?

There's nothing here, are there any hs_err_pidXXXXX looking files in .minecraft?

Try updating Java

Please provide the installer log using one of the paste sites in my signature below.

Please provide debug.log using one of the paste sites listed in my signature below.