website: handle longer names in downloads

website/helpers/download_helpers.rb

@@ -33,8 +33,8 @@ end
 module DownloadHelpers
   def download_arch(file)
     parts = file.split("_")
-    return "" if parts.length != 3
-    parts[2].split(".")[0]
+    return "" if parts.length != 4
+    parts[3].split(".")[0]
   end
 
   def download_os_human(os)

website/source/downloads.html.erb

@@ -27,7 +27,7 @@ sidebar_current: "downloads-terraform"
 				<ul>
 					<% $terraform_files[os].each do |file| %>
 						<li><a href="<%= download_url(file) %>"><%= download_arch(file) %></a></li>
-				<% end %>
+					<% end %>
 				</ul>
 				<div class="clearfix">
 				</div>