This my error:

did the autoupdate finished downloading?

yes

Tried running it as administrator? (Depends where you put everything)

I ran as administrator and the visual error disappeared, but the "engine.pak was.

I'm not entirely sure, but check the path (in Autoupdate.exe if it lets you type it or Path.txt next to Autoupdate.exe) it should contains nothing other than something like C:\Users\Username\MyGameFolder\Data\
check this folder isn't read-only. Try deleting the previous engine.pak? These kinds of things.

then maybe you've set wrong path for the engine.pak location
what's the path?

I have the same exact error.. every time I can't update.. all I have left after this operation is an engine.pak file with 0 byte even if I try to erase it before autoupdate

the path is good, but after removal of the "engine.pak" from the "date" and run "Autoupdate.exe" is the culminating work in the folder "data" shows "engine.pak" but that is 0 bytes

works fine with me

I have the same error. Maybe downloading the newest engine package from the site might help?

I've just tested autoupdate and it works fine, it copied the engine.pak

please tell me what paths did you have set in the autoupdate (for EE SDK, VS, Game Data)

can you record video of the issue, show the autoupdate with paths,
show the game data folder before running update, and show game data folder after running update

http://www.youtube.com/watch?v=5JlxP9k3dQE

...the Game Data path should point to your custom project folder location, not EE SDK data..

thank for help