As Gargabee noted there is no "patch" file, which just means that you would need to (re)download the whole game if you're doing an offline install in order to update it, not that you can't update it.
We don't produce standalone patchers any more as Impulse can simply look at the files on the machine and the files on the server and download the ones that have changed; no messy or time-consuming packaging or testing on all different previous versions of the game is needed, so we can deploy patches much more rapidly. Most people at this point have internet access on their home machines, so this is not an issue generally.
As noted on the other thread, if you installed from the disc and it's not appearing in add/remove programs, please contact support@stardock.com for help in removing it manually.