Free download with purchase of x amount

[arkitekt]

I've been looking for a contribution but it's possible I've overlooked something... so I was wondering if anyone had suggestions on how to do a free download with purchases over x amount or possibly a free download when someone purchases certain items from the catalog.

 

Thanks for you help

 

Nathan

[arkitekt]

Any thoughts at all would be appreciated even if they aren't 100% solutions