The screenshot doesn’t show the version only the digital signature information.

As I said you will have to find out what version is contained within, e.g. hover the mouse over the file it will tell you what version is in there.

Without knowing the version number I can’t say what changes have happened.

If you already have avast 6.0.1289 you have the latest program version and any change to the digital signature would reflect the update of the virus definitions contained within the installation package.