I realized the error is because I moved the folder (after extracting) to Program Files. This seems to happen with the last few versions, too. This seems to be a permissions issue, but it'd be nice if the application was capable of running from that directory (especially since all those updates are also stored there). It's just easier to keep track of, and much easier to not accidentally delete.
What is the full path to your UpdateGenerator.exe?
Wer Rechtschreibfehler findet, darf sie behalten oder an den Meistbietenden versteigern. / Everybody finding a misspelling is allowed to keep or sell it. aker
Please try a path, which does not contain a space (e.g. "C:\wsusoffline").
Wer Rechtschreibfehler findet, darf sie behalten oder an den Meistbietenden versteigern. / Everybody finding a misspelling is allowed to keep or sell it. aker