Hi,
I this that this can be done with the business version, you'll have to :
1. create your product named "coupon" for example, upload your 5 CV file into this product, then your customer will be able to downloads them after that he purchased them, and set the "User group after purchase" option to a special group named "coupon group" for example.
2. create your coupon, set the "Access level" option to your user special group "coupon group" and set the "Auto load in cart if possible" to YES.
Then it should do the job, if you want to send it through your emails notification you'll have to edit your emails code through "Hikashop->System->Emails".
Hope this will help you a little.