y depending on the versions involved.  The key versions
    to watch out for are the ones noted in this section where
    database format changes have occured.  The following lists
    release numbers where a format change occured:
    </p>
    <ul>
	<li>2.0.0</li>
	<li>2.2.0</li>
	<li>2.5.0</li>
    </ul>
    <p>For example, if an archive was last updated with v2.5.0,
    processing the archive with a previous release will cause problems.
    </p>
    <p>A possible method for successfully downgrading to a 