you don't need to pull the SD card. If you download the image with putty, you already have the image on sd, in the . Update folder.
When you restart, update start in automatic. When finish, the system restart.
If download don't work maybe you have some internet issue.
William Fanelli
Thanks willyfan. I tried again this am and the download failed again at ~ 28%. I cleaned out the .update folder with the putty command rm -rf * and retried the download. It completed the download after this.
Rebooted and the image loaded and completed the update.
Would be great if your instructions were posted on the 1st page. They are a lot simpler to understand.