I know this game is old, but I don't know where else to turn. I have an official copy of Hexen II installed. I downloaded an image copy of Portal of Praevus (simply because the bugger is so hard to find), the mission pack for Hexen II. I can't install it; it says, "an installed copy of Hexen II is required". But it's installed! I installed the original game in the default directory.
I'm guessing that Praevus' installer can't "see" the installed game; perhaps it's looking for a different directory? Is there someway in the install files that I can check this? Or is it something else entirely?

If someone has any advice I'd be very thankful.

Btw--Windows 2000 Pro

open the installer with winrar then open setup inf see where it installs probably c: then change inf info to your hexen folder and close winrar overwriting inf its a long shot .

Thanks, man, but WinRAR won't let me open setup.exe--file is either damaged or unknown format.

Nevermind, sorry, I've just reinstalled Hexen II and the Mission Pack installed.