DaemonUmbra

Oh wait, I see now... Update your JDK

Try without Optifine

1.7.10 is no longer supported on this forum due to its age. Please update to a modern version of Minecraft to receive support.

The names of some of your mods suggest you are not getting them from official sources. Please read my signature for more info on why this is a problem.

Go to Chrome's downloads page, you should be able to force the download from there, and the Forge team don't have the funding for that kind of bureaucracy.

Can we just get to the point of why you appear to be avoiding Java like the plague?

Chances are your command prompt is looking in the wrong folder. If your prompt reads C:\Users\xxx> then it is looking in the C:\Users\xxx folder, while the Forge file is probably in your downloads folder, two ways to get there: Open file explorer and go to the folder that has the Forge jar in it, make sure you have nothing selected and right click any place that won't accidentally select a file, you should see an option to open Powershell or CMD in that location. Simply type cd {Path To Folder} to go to a folder, this works with relative paths (paths that assume your currently selected directory to be slapped on the front) and absolute paths (paths that start with the drive letter and go all the way to the file or folder).

No, everything has to be between the { and } at the beginning and end of the file, respectively. And if you stick it on the end, put a comma at the end of the previous line

I believe you can go to Chrome's download manager (ctrl + J) to download the file anyway. As for preventing this outright, not without a massive amount of money that Forge doesn't have.

What MCP Mappings are you using?

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

Forge doesn't do anything to existing Launcher Profiles, it installs itself as a Minecraft Version, you need to change the version that your profile uses.

Could you provide your build.gradle?

Spot the difference.

Please read the "Logs" section of my signature below and provide the appropriate log in the appropriate manner.

Do you mean it launches Vanilla? Do you mean it makes a Window with only black in it? Do you mean there is no window? Does the launcher say the game has crashed? Does the launcher acknowledge that the game launched? Can you provide any logs?

Please provide the debug.log (more info in my signature)

The names of your mods suggests you're not getting them from official sources, please read my signature for more info on why this is a bad thing.

Ok, open notepad and File -> Open, then find the json In short inside the json everything should be between two curly braces { }, every line of text inside those braces that is not the last line needs a comma

Please read the "Logs" section of my signature below and provide the appropriate log in the appropriate manner.

1.7.10 is no longer supported on this forum due to its age. Please update to a modern version of Minecraft to receive support.

Yes No, that was to indicate "Don't literally type this, type what this is describing"

That is more a question for the developer of UME rather than Forge.

That is the Minecraft version, you need to know the Forge version. Twitch puts its Minecraft files in Documents\Curse\Minecraft\ You have to make sure you add the exact text "logging":{}, the rest of it is trying to explain how to add that line while keeping the file readable to the launcher, easiest way is to find the end of the file where the last } is and put "logging":{} on the line just above and putting a comma on the end of the line just above THAT. Unfortunately there is a reason I say to close Twitch and keep it closed through these tasks, if Twitch is running and you try to launch the pack through it it will reset the file we are changing, and it will reset it to Twitch's version of the file which breaks Forge's logging. That's me trying to explain what the script does and how to use it, essentially it launches the Mojang Launcher the same way Twitch does, but my script doesn't reset the file we changed like Twitch would. To use it just save it to your computer and in your twitch files find minecraft.exe and put my script next to it, then double click my script.

Please try to go through this step by step, which step are you stuck on? You copy/pasted a bunch and one is out of order.