@jl1ny, Glad I was able to help and that it worked. Congratulations.
These problems are frustrating. I suggest you reboot your Router and modem. I also suggest you reboot your Aurender unit (power down and start).
If you still cannot download the software update, please go to your Aurender Remote Request tab (in the settings section) and enter a remote request about your Aurender not down loading the 5.21.958 update. Please keep us posted.