Because I was late getting the final files sent out, the installer will take a couple of days to make, as will the final release notes. Until then, those of you who don't have the patience to wait are welcome to the manual install package. You'll find it in the downloads section here. You can find the preliminary changelog in my blog (Munderbunny).
If you don't know where your install directory is, or you just don't like mucking with this stuff, you'll need to wait for the installer. The installer will work on 1.1 and 1.17a.
If you do know where your install directory is, then you're welcome to use the manual install package. Note: you must have the latest patch (1.17a) installed prior to installing Underlord.
Enjoy dudes and dudettes.