The link above seems to be broken or expired, so I've provided two more which I found on the original creators post in a Czech forum for those still having a problem with this and are awaiting for Ubisoft to fix it themselves (without requiring a full reinstall or even reinstalling the launcher).
Simply follow one of the two links below, download it, unzip the file and run it as administrator. Use the second option down the bottom to advance the progress (I can't read Czech, but I assume the first option translates to "Previous", the second to "Next" while the third likely being "Cancel" like most typical installers/patchers/fixers).
Both links and files are clean and empty of any viruses or threats, but it does the job. The way I did it was with my at then current install of Revelations 1.02 I ran this fix over it and then simply ran the autopatcher again to do 1.03, let it install fully then exit the launcher then installed The Lost Archive DLC straight over it without fail.
It all works fine and doesn't require the more lazy "solution" of having to reinstall the entire game or a launcher for an autopatcher that should be finding the files and doing what it has to do on it's own. I'm not one to complain much either, though it puzzles me at the fact that an apparent amateur who isn't an employee meant to do this thing got a fix out first.
But, it's a fix regardless...I'll take what I can get, if it works for anyone else then good for them...my version is the Australian Retail "EU" region and has apparently worked for different versions as well, so give it a shot if you're still trying...the links that worked for me are below. I take no credit obviously, just reupdating apparently outdated stuff.
http://downloads.playman.cz/patche/ACO_patchFIX.zip
http://www.edisk.cz/stahni/58470/ACO...p_42.16KB.html