If the forum doesn't work for you (haven't tried myself, but I think you have to register separately), you could also try contacting 3D Realms via message on the contacts page or e-mail.

https://3drealms.com/contact/

Also check your bank account to see if you were actually billed.

By they way, 5 minutes after buying this my bank contacted me and asked if I made the transaction myself or if my card was stolen. They do it sometimes usually when I buy airline tickets. The guy for the bank told me it's an automated system that flags some transactions as suspicious (especially if made abroad) and they have to call to verify.

Could something similar happen to you? Maybe the transaction was blocked?

How so? I just bought it without any issues, no proxy or anything.

Seriously, what's the deal with Commander Keen 6 being relegated to ethereal oblivion, both there and on Steam?
Great package otherwise, but that pisses me off.

The forums have different accounts.

The 6th Commander Keen was published by FormGen. Formgen themselves were later bought by GT Interactive and GT Interactive themselves, were bought by Infogrames, who later renamed themselves to Atari. Needless to say, just like Flat Rock Software had the rights to Keen Dreams till very recently, it's very probable that Atari still has the rights to the 6th Commander Keen. At any rate, it's a messy case.

Huh, knew about Keen Dreams, of course, but what a weird decision back when.

In the FAQ they mention this package will be available on linux and mac later. I dont get what they mean since dosbox already runs on mac and linux, unless they are porting every game, which seems like a lot of work if the source code to them is even available.

Maybe a glitch, but it seems like the discount's duration has been extended for 1 more day.

OK, while the games run smoothly and without any problems, there is one thing I dislike. The dosbox conf file sets the resolution to a fixed value of 1280x800, which is a widescreen resolution.
While I imagine it was done since most users have widescreen monitors, it makes the game look stretched. Personally I prefer to maintain the aspect ratio of 4:3 and have black bars on side.

It might be a good idea to check the Dosbox conf file before playing. I do it even with GOG games.

Still it's nice that GOG gives you the ability to change some graphics options easily through the Graphics Mode Setup, for those not used to text config files. 3D Realms should learn from them...

I really like their launcher, it would be nice if all of the games were on GOG, but either way, this is fantastic. Nice to finally be able to play Alien Carnage again.

Nope, it's not a glitch. 3D Realms decided to extend the sale for another 24 hours:

https://twitter.com/3drealms/status/526029002755305472

Then, they did a poor job on their main page, as it still shows it as a 48 Hour sale there.

EDIT:
OK I see that you did write they were meant to stretch vertically.
But in order to see the image as it was meant to be seen on the CRT monitor, Aspect Ratio has to be enabled so the game maintains its 4:3 ratio. Which is not the case.

Each one has its own.