Hello. You have still link wrong. We have error in our official documentation page, links are there broken, please, use links proviede in this thread:
www.artio.net/support-forums/vm-invoice/...ntend-with-vm2#30410
Lines with link should be:
<!-- START: ARTIO VM INVOICE ICON INTEGRATION -->
<td align="center">
<?php if (class_exists('invoiceHelper') &&
invoiceHelper::getInvoiceNo($row->virtuemart_order_id)){?>
<a href="index.php?option=com_vminvoice&controller=invoices&task=pdf&cid=<?php echo $row->virtuemart_order_id ?>" target="_blank">
<img src="<?php echo JURI::root()?>media/media/images/mime-icon-16/pdf.png">
</a>
<?php } ?>
</td>
<!-- END: ARTIO VM INVOICE ICON INTEGRATION -->
Please, confirm after pasting code your code visually, if it agrees with code provied and was not deformed through copy-paste process.