The installation of doctrine is very easy. Just get the latest revision of Doctrine from http://doctrine.pengus.net/svn/trunk. 

You need a SVN(Subversion) client for downloading Doctrine.

To check out Doctrine using the **svn** command line tool in the current directory use:
<code type="bash">
svn co http://doctrine.pengus.net/svn/trunk . 
</code>
Do check out using a GUI based tool like [http://tortoisesvn.tigris.org/ TortoiseSVN] simply use the http://doctrine.pengus.net/svn/trunk in the the path field. No username or password is neccesary.