OK - I just discovered that if Expiry Days is set 0, the "download count" doesn't count (no pun intended).
I tested same product with Expiry Days set to 7 and this indeed allowed only one download.
The only problem now is that I tested that with Set Order Status (for the Zen Cart Charge Card) to "Delivered". I am going to revert back to "Processing" and see if that makes any difference.




