$addOnModel = XenForo_Model::create('XenForo_Model_AddOn');
$fwVersion = $addOnModel->getAddOnVersion('yourframework');
if (!$fwVersion) {
self::printFwRequired();
}
else {
if ($fwVersion['version_id'] < self::FW_REQUIRED_VERSION) {
throw new XenForo_Exception('new framework version > ' . self::FW_REQUIRED_VERSION . ' required', true);
}
}