Easiest if you just simply download the conventional way, through the website with GoG Downloader. Failsafe way to download games.

doesnt it take longer?

Actually, for most people it took more time through Galaxy, according to the last week's forum posts. I'd start right away if I were you.

thanks to you im going to redownload the witcher 3 AGAIN ..never download from browser its a stupid idea

+yousef
+mmarci

mmarci is right. use the basic gog.com downloader. dont use that gog galaxy client thing. it doesnt work. first, i used the gog galaxy, downloaded the game for like a day. then when its time to play, the client wont allow me to play (the PLAY button is disabled and when it tries to update, it fails!] so get rid of the game. uninstall it from your PC. uninstall also your GOG galaxy client program too. Just start back to zero. And then download the game from GOG.com using the GOG downloader. Yeah. this is what i did and it works. It's a bitch to wait because downloading this 22+GB is taking a long time but I have prepared for this so I took a day off from work. HEHEHE. Boom!

+mmarci
+xcom25msl
How da fck do you download through gog download in the gog galaxy it comes up to 100% and says : server problem i dont know how to use this gog downloader and through the gog.com it askes me to download 20 different links which im not going to do pls help !

1. Get the GoG Downloader and install it
2. Go to Account ->Library
3. Choose the game
4. Click More ->GoG Downloader links
5. Download the installer and the patch (and whatever else you want)
6. Run the installer and the patch
7. Have fun

Where is this library ?!

Ehmm... At the top menu on GOG site.

Hover over Account on the GoG website, drop-down list, first option. Alternatively just click on Account.