what did they add ? there was game update it was 3 GB bigger

When? Unfortunately updates have totally gone on the website so can't see if anything is updated. There used to be a change log under more button, probably a galaxy only feature now.

The recent flag for The Witcher 2 was about an update from a month ago, which only affected the Linux version of the game (basically they replaced the old tar.gz file for a MojoSetup installer like the rest of the Linux games).