OK guys, I've got this issue resolved.
You have to call Apple Developer Support (not the regular Apple Support)
Mention that you have a 10.12 failed dwonload (they've asked me to post this to help you guys)
You will be given a new unique redemption number.
Happy to help, tweet if you need more info
@spaceshipdev
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Edit: I originally listed the number but for some reason it seems to have been changed... I have removed the number though I assure you this is how to rectify the failed download issue. Eric is the gentleman that I spoke to, in fact he called me back after I had originally called in and being told that they do not deal with beta software. THEY DO deal with developer software. Eric informed me that this issue is in fact a regular thing every new beta release and thats why he called me back.
Hope this clears things up, no one actually reached out to me on twitter so sorry, I only just checked back on this thread to see how things are doing.
Good luck.