Add to downloads page a note on Upgrading, a=chris

diff --git a/en-US/pages/downloads.thtml b/en-US/pages/downloads.thtml
index a0c5293..c474ed2 100755
--- a/en-US/pages/downloads.thtml
+++ b/en-US/pages/downloads.thtml
@@ -2,10 +2,12 @@
 <h2>Yioop Releases</h2>
 <p>The two most recent versions of Yioop are:</p>
 <ul>
-<li><a href="http://www.seekquarry.com/viewgit/?a=archive&amp;p=yioop&amp;h=714e33c174a3201c0b35118df05faeaccf71c34a&amp;
+<li><a href="http://www.seekquarry.com/viewgit/?a=archive&amp;p=yioop
+&amp;h=714e33c174a3201c0b35118df05faeaccf71c34a&amp;
 hb=ba6ab2a825d58af3fa7465ae26bdc9e292a49468&amp;t=zip"
     >Version 0.941-ZIP</a></li>
-<li><a href="http://www.seekquarry.com/viewgit/?a=archive&p=yioop&amp;h=da73fb8ad24ba67201a3cccaa6290d711f505ef3&amp;
+<li><a href="http://www.seekquarry.com/viewgit/?a=archive&p=yioop
+&amp;h=da73fb8ad24ba67201a3cccaa6290d711f505ef3&amp;
 hb=fb79c4c0b11379bee3b8c4c803f9f938a9001c16&amp;t=zip"
     >Version 0.921-ZIP</a></li>
 </ul>
@@ -17,6 +19,14 @@ The documentation page has information about the
 >requirements</a> of and
 <a href="?c=main&amp;p=documentation#installation"
 >installation procedure</a> for Yioop. </p>
+<h2>Upgrading</h2>
+<p>Before upgrading, make sure to back up your data. Then download the latest
+version of Yioop and unzip it to the location you would like. Set the
+Search Engine Work Directory by the same method and to the same value as
+your old Yioop Installation. See the Installation section above for links
+to instructions on this, if you have forgotten how you did this.
+Knowing the old Work Directory location, should
+allow Yioop to complete the upgrade process.</p>
 <h2>Git Repository / Contributing</h2>
 <p>The Yioop git repository allows anonymous read-only access. If you would
 like to contribute to Yioop, just do a clone of the most recent code,