Here's what I did, step by step, exactly, for utter newbies.
Step one- Download the abandonia version. Dont bother with putting it into your DOSBox directory, all you need from the download is a single file; the LD2.exe
Step two- Get the "other" version of the game, in addition to abandonia's. The "other" version is a zip file inside an RAR file. Extract the files inside the ZIP into a non-compressed folder.
Three- Go into dosbox. Type "mount a <the address you extracted the "other" file to; for example c:\hotu\LD2>
Four- In dosbox, navigate to the folder you extracted the "other" files to. Run "install.exe" by typing "install" into the dosbox prompt and hitting enter. It'll ask you some questions. Yes, you have VGA. PC Sounds, please. Load the sounds into XMS/EM. Install to hard disk. Install from the A drive. I dont think it matters what size of disk you say. It should ask you to insert disk 1, disk 2, etc. Just hit any key to continue. WHen youre done, it should be installed into "c:\LD2". . . actually it will be whatever folder you told dosbox to mount as your C drive. For me, I told dosbox to mount my (actual) c:\DOS\CDRIVE folder as my C drive, so the "other" version of the game got installed into my (actual) c:\DOS\CDRIVE\LD2 folder. Make sense?
Now, in windows, go back to the first file you downloaded, from abandonia. Take the file install.exe and copy it into the (actual) folder that the "other" game installed to. For me, I took the install.exe from the abandonia version and copied it into c:\dos\cdrive\LD2. REPLACE the existing file with the new one you're copying over.
Now, to run the game. Get into dosbox. In your default directory should be a folder "LD2". Open it, and type LD2 to run the game.
... I think.

k:
Thanks to Alkarion at
http://vogons.zetafleet.com/viewtopi...8e313c3d3bc875 and defeodation here at abandonia for the instructions.