Minecraft Crashing apun launching with forge

[Voltingshock]

I am trying to used forge 1.7.2 but because of java problems had to take steps to fix forge using java stuff to insert into folders and such, I am on mac and watched and did all the stuff in the following video, just for mac not windows or whatever that is: https://www.youtube.com/watch?v=eRDxkt9ThIw
WHen I try to launch forge 1.7.2 I get this message:
Name: forge-1.7.2-10.12.2.1121.jar
URL: http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.7.2-10.12.2.1121/forge-1.7.2-10.12.2.1121.jar
Error details: HTTP 404: Not Found
Filename on disk: 8ce9-0f7d-fccc-b13f
Path: /var/folders/1h/2s2z3pld6478_sbp5ckrt21c0000gp/T/8ce9-0f7d-fccc-b13f
Exists: file

 

I also tried 1.12 to no avail it didnt work

I then installed java 7.81 or whatever the latet version of java 7 and nothing is fixed.

PLease help

[Voltingshock]

Ok, but I am still having the exact same problem with 1.12