Whenever I tried to install forge 1.8, this comes up.

"These libraries failed to download. Try again.
com.typesafe.akka:akka-actor_2.11:2.3.3
com.typesafe:config:1.2.1
org.scala-lang: scala-actors-migration_2.11:1.1.0
org.scala-lang: scala-compilar:2.11.1
org.scala-lang.plugins:scala-continuations-library_2.11:1.0.2
org.scala-lang.plugins:scala-continuations-plugin_2.11.1:1.0.2
org.scala-lang: scala-library:2.11.1
org.scala-lang: scala-parser-combinators_2.11:1.0.1
org.scala-lang: scala-reflect:2.11.1
org.scala-lang: scala-swing_2.11:1.0.1
org.scala-lang: scala-xml_2.11:1.0.2"

Please help me, I'm dying to install mods I want to play as this had been happening lately. I was able to play minecraft with mods last time, but I don't know why nowadays I can't install forge 1.8. I saw a forum that someone used DOS to install forge, so can someone please tell me how to install forge using DOS? I was able to install forge last time using that command, but I forgot the command for it.

P.s Would appreciate if someone answers asap, thanks!