A system and method for selling software products over a network. The system includes a server computer with access to software products. The system is configured to allow a user to purchase a subscription for the periodic acquisition of selected software products. In one embodiment, as part of the subscription, the user pays an amount during selected billing intervals. In return, the system issues to the user a number of credits for downloading at no additional charge at least one of the software products during a credit interval, which may be equal in length to the billing interval. In one embodiment, the system debits a number of credits in response to fulfilling a user's purchase request. The system may be also configured to deduct credits that are not used within selected credit intervals.