Liixann, TweetyCZ - I recommend sending an email to michael.wetzel (at larian). Apparently he's the one in charge of CE/Kickstarter problems now. He should be able to look into your case.

Durango - that's an issue on the GOG side. GOG promised several weeks ago to fix it "soon", but not much has happened yet, and they don't seem to be in a hurry to reach out to the people who still have this issue. The easiest way to get it fixed, appears to be to contact GOG support, refer to this post from (GOG's) Konrad on their forums ( www.gog.com/forum/general/release_divinity_original_sin_2_full_af83c/post77 ), tell them you still have not received the digital extras for the Kickstarter CE (the exact same extras that are in the DOS2 Divine Ascension upgrade), and ask how much longer you will have to wait.
Make sure to include the info for the DOS2 Kickstarter CE from your account settings (look up your DOS2 title in www.gog.com/account/settings/orders, select "view receipt" and either provide that info (the full game title name, date and order id) or a screenshot of it.
Also, make sure to give your post a clear title, such as "Kickstarter CE Digital Extras"
It may still take a week or so, but several people have received a reply from GOG support with an updated key that adds the Divine Ascension upgrade to your account.