I greatly appreciate everyone working with us. We are still in the middle of troubleshooting the problem.

Here is what we have to date:
Bad News: We still have not been able to duplicate the problem, over the week-end I used three different computers in three different neighboring cities, running three different types OS, anti-virus, unzip, etc. 

Good News: We have a member who is having the problem working closely with us and we have determined the problem to be files that are over 1 mb.  Based on some other variables we have ruled out, we are down to just a few options.  We are working now to rule out those last few possibilities.

It DOES appear to be a routing issue at our co-location facility. We are coordinating our efforts with the co-lo's technical staff in order to isolate the variables and rule out the last few remaining possibilities. 

We will work to ensure everyone can get the files that they purchased. We haven't gone the route of putting files on another outside server, because of security issues around making sure the files are protected and can only be downloaded by the people that have bought them. However, if this problem cannot be solved soon, we will work out the delivery.