The sale is over and I unlocked them both, but they haven't appeared on my account

I think you should check your email box. Possibly spam folder as well since codes suppose to be sent by email to you..

You needed to click on them to claim the codes. If you can't find an option to do so, I would recommend contacting GOG support, who will more than likely issue you with codes.

Check your email and you should get something titled "Hey, your free game has arrived!", redeemed it manually.

^Yep. Can confirm that GOG will send you an email with the title "Hey, your free game has arrived!" with your free game just as zlaywal said

NOTE
Those GOG mails may have a strange title in different languages.
For example, my mail have a title in Chinese, not English, while my prefered language is English only.
My previous mail have a title that I can not read.

*facepalm*
Sounds like GOG is using country/IP to decide language for the emails instead of paying attention to the language setting you use on the site.

No.
I have got at least four different languages in those GOG redeem code mails.
Only latest one mail is written in Chinese.
GOG Profile also have similar bugs.

I have reported those bugs weeks or months ago, but GOG never fix them.

As noted, you get the keys in a pair of emails.

If you haven't received them, you're going to need to contact support about it as we're not going to be able to help you here in the forums.

Hope this helps

Silly me. I found the emails. I didn't know how you acquire the games. Thanks.

Seems like I wasn't the only person not to notice them. :)

Just a fyi, when it's a banner giveaway on the front page, they get added directly to your account.
Always amazes me how many people don't check their spam folders once in a while to see what got dropped in there by mistake. :)
edit: I get all sorts of automated emails from our servers and GMail doesn't like them even though filters exist to try and keep them out of the spam folder.

I did that to avoid having to deal with Google's CAPTCHA.

I received a politely-formed equivalent of "yeah, not gonna happen" to a request to have Rime added to my library.

Which is all the more surprising because last year GOG staff did so within one day with no hesitation whatsoever.

I asked to have the issue escalated (seriously, why the insistence on Google's data-mining?) two days ago, haven't heard anything back.

Also when you unlocked them you were able to just click on the icons of both games on the front page of GOG and it would pop up the key and if you clicked on that it would to take you to the redeem page with the key filled in for you.