I actually didn't link the "My posts" page, but the "Community" page. There's a sort of endless scrolling list of topics in which you've participated. I'm not sure how far back it can go, though (it might just be the same topics that appear on the "My posts" page).
If what you're looking for doesn't show up there (and you can't find it in your browser history), Google is a great alternative. GOG's search function is a bit iffy, but with the right search keywords you can find what you seek! You can also filter the Google results to a certain date range to better target what you're looking for.
Oh yeah, sorry, I do see you referenced a different screen. Still though, I clicked on the "See more" button until it disappeared and no luck, and they sure do look eerily similar to the threads under the "my posts" page.
I just did a quick google search (actually ixquick, which uses google but keeps your privacy) and got no luck either, but I suck at searches so that's probably not google's fault.
I swear though at most forums I've ever posted at, it was always much easier to find stuff, particularly my own stuff.
I tried my google fu, but only found this thread: http://www.gog.com/forum/general/red_orchestra_2_will_be_free_on_steam_today/page1
...which has no post of yours though, sorry.
Yeah, I got that one too.
There was another post where it was being discussed, because it was a question as to whether or not you had to actually download the game or at least start downloading the game in order to keep it. And I posted I would gladly be a test subject since I didn't particularly care whether or not I eventually ended up with the game.
So, I didn't start the download at all.
And I can say, a full week later, that despite not ever starting the download at all, the game still appears on my library and when I go to install it now, it appears to have no trouble as no warning screens or anything pop up. I still haven't actually started the download because it's a huge file (over 10GB) and I don't want it at all on this laptop, but I did pretend to start it today, and it appears to work.
So I wanted to respond in the right thread that the test results were in, but now I can't find the thread. LOL