I still can't get it to work. I installed the firmware update and I've gone to the store all day and still don't see it. It shows me the new Facebook app etc. but I can't install it because I don't have 8.1. Still not sure what to do to make it appear...
I tried to force it using the other link you provided to be pasted in the browser.. and it gave me a message that the update failed immediately because of error code: 0x80200056
Any clue what this error code is? Nothing comes up when I did a search.
I'm having the exact same issues as Borka and have been following this thread all evening. Everything on mine is also up to date, trying to go from preview, but still no 8.1 update available. I have an RT 64, with 24.8 gigs free. Any help would be most appreciated...