This will never get fixed. I opened the original SR and it took them 4 months to tell me to switch the port. They never went in and fixed the code to allow it to download properly. Now they broke exporting of images.
If you need to export images, do what I do. Keep an ISO for vCenter 7.0.2 (0500) and spin it up when you need to. That version still lets me build any ISO with any version of the vendor add-on and export it. Until that stops working, we have a backdoor per se