To be honest Aftermath has a spot in my heart. It was the game that made me buy and install my first video card when I was little because it wouldn't run on the poor 4mb built-in my old Compaq had back then. Also had to learn how to update Drivers and edit INI's in win98, sigh memories.
At least with XP and WIn7 the game runs fine for me and I have memories of pretending I was Malcolm in the game so I would never let him die. I also did that for Paul Jonlan in the first XCom lol. Anyone else do that in a game like these?

I'd like to point out that the headline for the promo is incorrect, it is being billed as the "complete UFO series 50% off" but is missing the third and final game in the trilogy, UFO: Afterlight. Any chance that the third game will be coming to gog.com any time soon? I may be tempted to pick up these two on deal if there were some indication I could get the third here too (especially with one of those "complete the package" promos)...

Agreed - I would like to get them as a bundle deal. However, elsewhere afterlight is selling for around $15.00. This does not fit into the current price points.

I'd like to see UFO:ET offered on GOG too. For that matter, how about getting the original X-Com games (at least the first three, up to Apocalypse) on GOG.
I also prefer to get games in a series as part of a bundle deal. I've seen UFO: Trilogy (as it sounds, all three games in one) priced as low as $12 CAD so it doesn't seem out of the realm of possibility for GOG to do all three games as a bundle deal, rather than the first two only. Offer the third for $9.99 or the bundle for $15-20 ($5.99+$9.99+$9.99 minus bundle/sale discount) and I think it would sell just fine, I know I'd get it...
EDIT: to clean up error in using the quote codes (I'm new and am still trying to decipher how to properly use this stuff). This forum really needs a "preview post" function...

It would require 2K Games to sign with GOG, to have the original series here.
I got the first and second UFO here from GOG, so I need only the third one.
UFO: ET is from a different developer, so it's hard to see it in a bundle together with this Altar Interactive's trilogy, but not impossible. And since you guys talked about bundles, it would require GOG to adopt new price tags and new policies to offer bundles/packs.

I'm sorry, I wasn't as clear as I'd hoped/thought. I didn't mean to suggest that they bundle UFO: ET along with the altar trilogy, only that they bundle the altar trilogy together (or offer the single purchase named "trilogy" which includes all in one but then what about people who already got the first two?) and also, at some point, offer UFO: ET as well in the catalogue as a separate purchase.
As for bundles, can't they just do it like they've been doing the promo deals where if you buy them together (or already own some and are getting the rest) you get a discounted price? Couldn't they simply port that code over from being a time limited promo to a standard catalogue feature?

No need to be sorry. I'm not always clear, too.
Those are two different cases: bundle games temporarily for a promotion, or bundle games permanently with no discount (the ufo trilogy to be permanently added here, for example).
I agree with your point of ufo: et to be offered alone here at gog.