Hi,
Does the order right confirmed in your HikaShop backend order listing ?
The email "order status notification" is send to the customer when the order status is changed by a payment plugin ; if you do not receive the paypal IPN or you did not activate the option for the "payment notification" in your paypal configuration ; the order will stay with his "created" order status.
So if you want to send automatically the emails to the customer, the best is to check the paypal plugin notification.
The order point is that you can configure the order status where the download is available.
Which means that if the order status is not the right one (according to your configuration), the email won't contain the download links.
So please check your configuration and provide us more details about your issue.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.