That error is from a goof on Auroch's end when they pushed out the build.
I fixed it by deleting the Ogre.app file (this is on Mac) and then doing a verify of the files, forcing it to re-download.
- Right-click Ogre -> Properties...
- Local Files Tab
- Browse Local Files -> find the binary and supporting files and remove it
- Verify integrity of game files -> forces a redownload
One assumes you can do something similar on Windows