DaemonUmbra

The new system is still being developed and tested, it's not ready for use yet, however there are manually-created mapping versions pinned in the modder-support-116 channel of the Forge Discord

You need Java to run a jar file...

Don't start a new thread just because things aren't going your way...

I don't know the process for Mac

The one labelled "installer"

Do not download the file labelled "launcher", it's useless unless it is properly set up by the installer.

Please use one of the paste sites listed in the "Logs" section of my signature below.

This is an Optifine issue, not a Forge issue. Forge is open source, Optifine is not.

Your computer is using Oracle over OpenJDK, uninstall Oracle Java

Do you have Optifine installed? If so, remove it.

Please don't Necro old threads. Your version is unsupported. You are a pirate - Banned.

If you have Optifine installed, remove it

What version of Minecraft are you using?

Sounds like you've somehow set Notepad to open Jar files. If you have Java installed, try running JarFix to correct the issue

Shaders are an Optifine thing. Forge is open source while Optifine is not. It is on Optifine to fix.

...remove Optifine

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.

That's terrible, and I mean the app. That app has stolen the .jar file extension from Java, run JarFix to fix the issue.

I recommend getting Java 8 HotSpot from https://adoptopenjdk.net Your issue appears to be that your JRE is missing a certificate to authenticate the Forge server so the installer won't accept the file from it, the above website provides OpenJDK versions that are known to have the correct certificate

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

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

What minecraft version are you using?

This feature was left out of the rewrite that took place in 1.13 because the "Installations" feature of the Minecraft Launcher is infinitely superior

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