I played the Aliens TC: SE mod that I found here and thought it was probably the best TC I have ever played.
So, like always, I decided to show my respect and make it standalone. So here it is!
This is the final version of Aliens TC: Standalone.
It requires no other files except for the music if you want it.
From the "New Game" menu you can access the following:
Alien Host Ship
Alien Host Ship Remix
You will also notice that there is a "colonialmarines" folder. If you open "Install Colonial Marines.bat" in that folder. It will install the Aliens TC: Colonial Marines mod by Deimos Anomaly. You cannot access the other three episodes when colonialmarines is activated because it causes a whole range of bugs for them.
All credit for Aliens TC: SE and Aliens TC: Colonial Marines goes to their original creators.
Final Version: http://aliens-doom-tc-standalone.googlecode.com/files/AliensTC_Full.rar
Music WAD: http://www.sendspace.com/file/96lulu
Main Download : http://aliens-doom-tc-standalone.googlecode.com/files/aliensstandalone.zip
Update Packet #1 : http://aliens-doom-tc-standalone.googlecode.com/files/gzdoom.pk3
Update Packet 1:
Adds episode selection to new game menu (Campaign and bonus) and also has an updated mapinfo.txt file.