Crm::isOldInvoicesEnabled

public function isOldInvoicesEnabled(): bool
{
	if (!$this->includeCrm())
	{
		return false;
	}

	//enabled if the new update with smart invoices is not installed
	$isOldInvoicesEnabled = true;
	if (method_exists(InvoiceSettings::getCurrent(), 'isOldInvoicesEnabled'))
	{
		$isOldInvoicesEnabled = InvoiceSettings::getCurrent()->isOldInvoicesEnabled();
	}

	return $isOldInvoicesEnabled;
}