I've downloaded the series for PC a few times and on a few computers. I get a folder called components (which seems to have individual files for installing one at a time for 2, 3 and 4, then one called "default"), an executable file which lets me install the first game, and a mystery file that seems to be nothing but is also called "components".
Installing the executable leads to an error that says "Could not load game data! Make sure you are running the application from the directory it was installed to". This happens no matter where I run it. Installing the default seems to work, but then it tells me that it's missing "thumbs", content_bg.png, login.png, mainframe.png, news ticker.png, rock left (and right).png, french and german localization files, and the mouse input file 0_input_mouse.ttarch. All this does is put a bunch of "ttarch" files in my C: folder.
I've never had any problems installing a TT game. What do I need to do?