FWIW, I was getting the storage error last night, too. Not sure if this fixed the issue, but I went into Settings/Storage and removed the SD card within settings, then shut down the phone and physically removed the SD card. I still got the storage error, but after what seemed like the 12th retry, the download started. Then I got the 0x802etc error right after the download finished and the installation started. Reboot, retry, and then it went well. I tried to keep the phone awake all through the download, not sure if that helped, too.
The newest OS is really fast, and very easy on the battery.
The newest OS is really fast, and very easy on the battery.