Hi Nayeem,
You’re trying the direct download link – which is not what users see.
Go to this page: http://www.nutemplates.com/invoices/blank-invoice-template/
You will see I have an “email lock” on Word & Excel download – they are not working.
When user clicks on them it adds #unlock in the URL and nothing happens.
Please note: there is no email lock on PDF download, which is working fine.
So, it is a problem with “email lock” functionality with download.
Please check again!