Tried it again today and same for me as well....still fails with same error as before.
Although interestingly I did see that on the MyAudi website under myAudi Special Destinations I now have a new button for "Send to Vehicle" that wasn't there before. As I understood things it was always there for Tech Pack owners but not those with the SD Card Nav. Anyway I tried clicking it but after a bit of processing it returns a page not found error for me.
However what's stranger is I can now go into the System update setting in the MMI and as well as the SD card update option I now also have Online update available. So tried that and somehow it seemed to work and find a file with my myAudi special destinations. So proceeded to download it which seemed to be working and then got a file download error right at the end....ahhhhhhh
Can only assume it must still effectively be the same error I get with the SD Card update method although it wasn't the same error message.....