def old_version(spec_ver):
    """Get the old version that was updated.

    :param spec_ver:  A tuple from current_version.
    """
    eq_ver = spec_ver[1]
    gte_ver = spec_ver[3]
    if eq_ver is not None:
        return eq_ver
    if gte_ver is not None:
        return gte_ver
    return 'Unknown'
