Same here, been trying since day one when it was supposedly free. It keeps redirecting me to buy the entire the witcher 3 collection. Same with the link which goes to " https://www.gog.com/#giveaway
The banner method mentioned re-directs to the tower of time all over again, creating a infinite loop. Tried on multiple browsers, multiple different operating systems (windows 10, windows 7, kubuntu, ubuntu, tigeros, android 9.0, tinzin 1.3) Attached is the screenshot of what the banner is that folks mention works, but in my case and a variety of tests, does not work.
okay.. every format of image I try to upload is wrong. But I got it to work at the time of this posting. Weird, worked on the Samsung s9+ dex mode chrome web browser, didn't work on it in its non dex mode variant. Just some information for those who struggling to get it. I just got it using s9+ Dex mode