I can't seem to find a link to download a normal, unmodded GOTY version of this game.

All the download links are marked with a "Revision" version of the game.

This is not what I bought and not what I want.

Where is my unmodded Deus Ex game?

Did you try to start the installer? I suppose that installation of the mod is optional and you can check/uncheck it during installation process. You can always abort installation if it's not.

If you download and install only the first file, the 408MB named Deus Ex GotY you will get just that. I think the Revision in the file name is to show it has support for the Revision mod dlc which you may skip completly if you so like. I keep reading that people suggest another great mod instead of that one anyway.

Yes, the GMDX mod, which is an massive improvement of the original game and what Revision should have been.