..but it says " you have already ordered this product (or a related product) the maximum number of times permitted." I don't have my old computer anymore. Is there any way to download it again?
Try using a new account. Maybe a new edx account.. I don't remember exactly how the downloading process goes...
You'd have to uninstall your virtual machine from the old device and have the serial number given to you when you initially installed to reinstall on a new device.
