revise download page to version 0.52, a=chris

diff --git a/en-US/pages/downloads.thtml b/en-US/pages/downloads.thtml
index de90795..ed9d5b3 100755
--- a/en-US/pages/downloads.thtml
+++ b/en-US/pages/downloads.thtml
@@ -2,9 +2,9 @@
 <h2>Yioop! Releases</h2>
 <p>The Yioop! source code is still at an alpha stage. </p>
 <ul>
-<li><a href="http://www.seekquarry.com/viewgit/?a=archive&p=yioop&h=88d28348e92e0738c18836f272d58cf926ce5589&
-hb=f3a2695351e280cdc7d11edd4cf6c3b4f297f84f&t=zip"
-    >Version 0.5-ZIP</a></li>
+<li><a href="http://www.seekquarry.com/viewgit/?a=archive&p=yioop&h=33b2b20ad6a61b08dc1dd0f0b469bb493496e656&
+hb=d616f6b87e0142a535d2ac32f8712450a21b59a3&t=zip"
+    >Version 0.52-ZIP</a></li>
 <li><a href="http://www.seekquarry.com/viewgit/?a=archive&p=yioop&
 h=a33319a5bc6ed58c11af462e8645397fe2c76f27&
 hb=62925b2e560ee4460ecbd9369534544b102b2a34&t=zip"