I run an independent record label and am using this Cart66 Lite for my online store. I just launched the store today and had a customer purchase 3 albums of zipped mp3's. The customer reports that all 3 of his downloads failed and he was unable to re-download due to store settings of only 1 download being allowed. I checked the zip files, they are all fine. I made a purchase myself of a single album, one that was reported to be a problem by customer, sale completed and it was downloaded with no errors. I made a 2nd purchase from my site, this time 3 albums. I downloaded all of them at once and only 1 completed. In the middle of the other 2 zip files downloading, they just abruptly stopped, leaving me with incomplete zip archives.
It would seem there is some sort of issue with concurrent product downloads? The files were about 150mb each.