I run Octave with the version 3.6.4. As I am unfortunately using Windows it seems as if there arent other testet versions of 3.8.X out there yet. At least if you have a look at the following "forge-link".
I am a complete strange to the Windows world, I am sorry.
Can't you just run Linux on a virtual box or using a live USB?
I have created a .iso file that includes octave 3.8.1, but the default
language is spanish (it also has english but not default). Wanna try
Otherwise, did you tried SOM package on that Octave for windows installation?