If you are getting this message it usually means that you are trying to run a second client on the same machine. Since this isn't allowed, it will give you this error message and then close the updater. Make sure that frontend.exe is not already running when trying to run the updater.
What do I do if when I start the patching process of the updater I get the message "Failed to open IFS filesystem: C:\Program Files\Fallen Earth\data.ifs"?
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