Fixed: Update UI will show that older versions are not installable

src/UI/System/Update/UpdateItemViewTemplate.hbs

@@ -4,13 +4,17 @@
             <span class="date">
                 - {{ShortDate releaseDate}}
             </span>
-            {{#if installed}}
-                <span class="update-installed"><i class="icon-ok" title="Installed"></i></span>
-            {{/if}}
-
-            {{#if isUpgrade}}
-                <span class="label label-default install-update x-install-update">Install</span>
-            {{/if}}
+            <span class="status">
+                {{#if installed}}
+                    <span class="label label-success">Installed</span>
+                {{else}}
+                    {{#if isUpgrade}}
+                        <span class="label label-default install-update x-install-update">Install</span>
+                    {{else}}
+                        <span class="label label-default label-disabled" title="Cannot install an older version">Install</span>
+                    {{/if}}
+                {{/if}}
+            </span>
         </legend>
 
         {{#with changes}}

src/UI/System/Update/update.less

@@ -7,18 +7,23 @@
     cursor        : default;
     margin-bottom : 5px;
     line-height   : 30px;
+    display       : inline-block;
 
     .date {
       font-size : 16px;
+      display   : inline-block;
     }
 
-    .install-update {
-      .clickable();
-      margin-left : 10px;
+    .status {
+      margin-left    : 5px;
+      font-size      : 14px;
+      margin-top     : -3px;
+      display        : inline-block;
+      vertical-align : middle;
     }
 
-    .update-installed {
-      margin-left : 10px;
+    .install-update {
+      .clickable();
     }
   }