Unable to update from 12.50 to 12.55

My atf turbo is unable to update from 12.50 to 12.55 it always show
Downloading Latest version… (Please wait a while…)
Download Done!!!!!
File Hash Mismatch!!! – Try Downloading Again
Plz help me
Attachment 345339

Attached Images
File Type: jpg untitled.JPG (142.3 KB)