Alien Trilogy Game Free Download & Install Guide

Author: Glenn Scrima

(Please do not copy this guide. However anyone is free to link to this page.)

First Download & Install Dosbox on Windows:

Go To: > Downloads Tab > Click the Windows version (Under the Dosbox category)

Dosbox homepage
Next: Run the downloaded installer file and install Dosbox on your hard drive in the directory C:\Games\AlienTrilogy. Simply entering this will create these folders for you.

Dosbox installation program
Alien Trilogy Windows folder
Next: Open the Games folder then the AlienTrilogy folder within it. Locate and then run Dosbox by double clicking on the Dosbox program icon.

Dosbox icon
Next: At the the command prompt in Dosbox type "config -writeconf dosbox.conf" and then press the "Enter" key.

Creating PC game config
Next: Type "exit" to exit Dosbox.

Exit command
Now: Locate and right click on the Dosbox config file. Click "open with" & select notepad.

Editing Dosbox config file
Finally: With the dosbox config file open scroll to the bottom. We are going to place some text below [autoexec]:

mount c c:\games\alientrilogy

Dosbox autoexec mount commamds
Save and exit the config file when you are finished.

Now Lets Download the Free Game Alien Trilogy:

Go To:

Next: Type "Alien Trilogy" in the game search box in the upper right corner of the main page and press enter.

Abandonia search box
After That: Click on "Alien Trilogy" in the game search results column.

Search results
Next: On the page that follows click on the "Get It!" button.

Download Alien Trilogy
Finally: Click on the "Get It" button on following page and wait for your browser to give you the option to download and save the Alien Trilogy file. Click the "Save" button and choose a directory on your hard drive where you would like to save the game file. Saving to your desktop is usually the default option and is probably the easiest place to save the Alien Trilogy file for extraction.

Saving Alien Trilogy zip file

Now Lets Extract the Alien Trilogy Free Game Download:

First: Right click on the Alien Trilogy game file you downloaded to your hard drive and click on "Extract All".

Extracting Alien Trilogy zip file
Then: Click the "Next" button when the extractor launches. You will be asked where you would like to extract the Alien Trilogy game files, select "C:\Games\AlienTrilogy". When you're done click "Next" again and the files will begin to extract.

Zip extraction program

Now Lets Setup the Game Alien Trilogy:

First: Double click on the Dosbox program in the AlienTrilogy folder. You will be launched into the program and brought to the C:\ prompt in Dos. Type "setsound" and press enter.

setsound DOS command
Next: At the "Current Sound Configuration" menu screen select "Select and configure digital audio driver" and press enter.

Sound Setup
Now: At the "Available Digital Audio Drivers" menu screen select "Gravis Ultrasound" and press enter. It should tell you that the "Device [has been] Successfully Detected", press enter again.

Selecting Gravis Ultrasound
Finally: Back at the "Sound Configuration Options" menu screen select "Done" and press enter. After this exit Dosbox, this can be done by typing "exit" and pressing enter at the C:\> prompt.

Finishing configuration
Although we have the game fully working at this point we still need to go back and quickly add another command in the dosbox config file. Head back to the Dosbox config file and scroll to the [autoexec] section again. Under the commands we have already added type "trilogy". It should look like this.

Editing Autoexec commands again
Save and exit the config file when you are finished.

Some Classic FPS Action:

Alien Trilogy screenshot
Double click on the Dosbox program in the AlienTrilogy folder and the game Alien Trilogy will now launch, enjoy!

The config file is missing what do I do?
The game won't run on Windows Vista. What should I do?
The game runs sluggish. Is there a way to improve this?
How do I make the game launch in fullscreen mode?
How do I change the amount of RAM available?
How do I mount a hard drive or CD-ROM drive in Dosbox?
How do I change my machine type in Dosbox?
How do I capture a screenshot during gameplay?
I can't download from Abandonia. What should I do?
How do I close or exit Dosbox?


Neon Knight said...

Thanks! Very useful!

Only instead of Gravis Ultrasound I had to choose Sound Blaster or 100% compatible...

Anonymous said...


Glenn Scrima said...

Enjoy the game guys!


Anonymous said...

Thanks, this really helped.

Two questions though:

-How do we get the music/soundtrack to play?

-Is it possible to get the CGI cutscenes to show?

David said...

i need help i have windows 7 64 bit how do i set it up its confusing

SickDickenhaim said...

thanks for Alien Trilogy :)

Glenn Scrima said...

No problem, enjoy!


Anonymous said...

When I try to play Aliens, in Dos Box it says that " You must have the Alien Trilogy CD in the drive. " and I do have the CD in my D: drive. What do I do?

radnia pauk'ar said...

my game is very very fast ):
exist a solution for this?

Unknown said...
This comment has been removed by the author.