DIABLO III was unable to validate core data files !

[ken1h]

i install the game, did the downgrade and created the shortcut just like it in the "how to connect" and an error appears "Diablo was unable to validate core data files" please help

[IceHeart]

Did you downloaded the game from the links on our website?
This means that you either have corrupted files since the installation or during downgrade while copying the files.

[mackyboy026]

hey! this was my problem last night and i tell you you need alot of patience to fix this, which i did.
All you have to do is:

go to C:\programdata
**delete Battle.net and Blizzard Entertainment folder
run the shortcut (must have -launch)
*wait for it to update and launch the game on itself
use the client.bat, alt+tab, login and play.

**dont worry about deleting those folders, it will be restored once update is finished.
*dont expect it to update on the first trial, as i tell you, patience is really really needed. And if ever it updated successfully, dont expect it to run without the unable to validate core data files. I did it i guess a couple of successful updates but still encountered unable to validate core blah blah, i think i did it 3-4 times until i see no error. Now im playing.