Hi, the upgrade is available from the dashboard, so you should be safe to upgrade from the version that you are right now to the last version by performing a automatic update.
For me the latest update fixed my USB Backup to my external WD My Cloud device which was awesome. Not so awesome was the fact that the CPU seems to pinned all the time. Response is brutal and I can’t keep a connection to the thing either through IE or Windows Explorer. All in all a major negative. New interface looks real pretty though.
EDIT November 5th: I was able to resolve my issues by going to SETTINGS → NETWORK and forcing the SMB to 1 (default I believe is 2). MUCH happier now It is apparently a compatibility issue between the NAS and Windows 10. Sorry I didn’t save the link to the actual article that posted the fix.