My game cannot be launched or updated with god galaxy i get a error number and failed to install update. The play button is greyed out and next to that says 'not authorised'.

thanks

Did you try restarting Galaxy in administrator mode? Also did you try a verify/repair?

EDIT : apparently, other people have this same problem. Official response on this thread :
https://www.gog.com/forum/general/cant_install_games

EDIT 2 : Aaaand apparently you already know this. ooops ;)

Looks like you're on an outdated version of the client somehow?

While you may have considered this option, at this point I suggest just playing Outlast straight from its .exe than using Galaxy.

Found your problem.

Im on Mac so theres my first problem lol.

Galaxy has recently updated etc but still cannot authorise outlast so i've just been launching from the file itself so no big deal anymore just a little ocd.

galaxy 1.1.12 btw

You have to use GOG Galaxy, not God Galaxy. He doesn't care for Outlast much.

He is more of a NES guy.

Oh dear, it appears that you specifically referred to the NES here, but the picture attached is based off a game (Super Mario World) that was not made for the NES (unless you count a totally illegal and unauthorized pirate game that does not look as good as the attached screenshot).

Yeah, you tell 'em, Miss Dee, you tell 'em.