Hi,
I also noticed that if I use the plugin I cant create the Hikashop invoice. It is downloading always the plugin's invoice.
That depends on the settings of the plugin. If you deactivate the invoice button override setting in the plugin, you'll be able to get the normal invoice from the interface while the PDF invoice will be attached to the emails.
I really thought that I could use the Hikashop plugin but I have to do too many concessions/modifications to get it right so I really would like to claim the 30 days money back.
A refund is possible. In that case, please follow the procedure here:
www.hikashop.com/money-back-policy.html
www.hikashop.com/support/contact-us.html
Merry Christmas !