Probably doesn't make a difference at this point but might be good feedback for GOG: I happily uninstalled and was ready to go at launch time, clicking "install" after I noticed the product page had changed and it no longer said in development. The ~60 gigabyte download made me a little concerned but I went with it (I have a fast connection). Low and behold, after the 30 minutes of downloading the game installed and then said there was an update--the ~108 gigabyte full release!

Pretty frustrating not being able to start as early as I wanted to. I think GOG should really do a better job at telling you what you're downloading, especially when the release is hyped to start at a specific time.