"Downloaded File Does Not Match"

[ItoUK 0]

As Title suggests, I have done everything I can think of, including clearing registry, uninstalling everything, restarting pc, disabling any kind of anti-virus/anti-'x'

nothing works, I have re-downloaded the game 5 times now each time it gets to 100% downloaded and shows the title as an error message (image attached)

 

I have spent the entire day trying to fix this issue, I have seen people on the forums have had this issue for years and have said that support gives them no support (I recieved none either) how is this not fixed yet? no other game has this issue, 45 euros is a lot for a game that's not even out yet and the fact I can't even run it is kind of frustrating.

 

any help appreciated, thanks.