I'm working with TAC as well in regards to this issue. It sounds there was a Pacth released which contained some errors so I was one of valentiers to pick one the file, nice to approach my weekend.
I had to downgrade this server to 6.2.5. From there I was able to https without any problem and after TAC deleve the 6.3.0 file from the storage folder /var/avenda/platform/storage/updates I was able to download the 6.3.0 once again.
Firmware upgarde and resting the server right now. By the way, other nodes in my cluster are in a clycle trying to download the wrong patch so I'm afraid I will have to do the same on the others.
more to come.
Thanks,
Antonio