The Sansa Updater error points to a server issue in accessing the desired files. Trying again at a later time often solves the issue, but it is far simpler to manually install, if your patience is variable like my own.
If you are currently running the .28 version, you have the latest and greatest, save the ongoing ReplayGain issue some mention with the rev. 2 devices.
The Sansa uses a checksum method to verify the integrity of a downloaded .bin file, and will not allow “cross pollenation” of revision 1 or 2 firmwares, so manually installing the firmware is a simple, and safe, task. Just be sure to decompress or unzip the firmware file after downloading, or it will not work.
Bob 
