Unable to download ruby source for the version 2.1, 2.2 and 2.3 while…

… building

URI::NotFoundError: Looking for http://cache.ruby-lang.org/pub/ruby/2.3//ruby-2.3.3.tar.bz2 and all I got was a 404! oneclick#392

config/ruby_installer.rb

@@ -122,7 +122,7 @@ module RubyInstaller
       :number  => "21",
       :version => "2.1.9",
       :short_version => 'ruby21',
-      :url => "http://cache.ruby-lang.org/pub/ruby/2.1/",
+      :url => "http://cache.ruby-lang.org/pub/ruby/2.1",
       :checkout => 'http://svn.ruby-lang.org/repos/ruby/branches/ruby_2_1',
       :checkout_target => 'downloads/ruby_2_1',
       :target => 'sandbox/ruby_2_1',
@@ -153,7 +153,7 @@ module RubyInstaller
       :number  => "22",
       :version => "2.2.6",
       :short_version => 'ruby22',
-      :url => "http://cache.ruby-lang.org/pub/ruby/2.2/",
+      :url => "http://cache.ruby-lang.org/pub/ruby/2.2",
       :checkout => 'http://svn.ruby-lang.org/repos/ruby/branches/ruby_2_2',
       :checkout_target => 'downloads/ruby_2_2',
       :target => 'sandbox/ruby_2_2',
@@ -182,7 +182,7 @@ module RubyInstaller
       :number  => "23",
       :version => "2.3.3",
       :short_version => 'ruby23',
-      :url => "http://cache.ruby-lang.org/pub/ruby/2.3/",
+      :url => "http://cache.ruby-lang.org/pub/ruby/2.3",
       :checkout => 'http://svn.ruby-lang.org/repos/ruby/branches/ruby_2_3',
       :checkout_target => 'downloads/ruby_2_3',
       :target => 'sandbox/ruby_2_3',