Nothing comes to mind. You are running it as administrator, right?

FYI, I've had a copy of 1.3.8a stashed for a while. http://www.l00py.net/Octopus_1.3.8a.zip It does have the PDF documentation that came with it at one point, and it might be newer than your copy (there were a few buggy builds in the 1.2.x and early 1.3.x days). Some of it is out of date possibly but it's the best I could find.