Since the themes aren't OTS2 compliant they won't work correctly because the files that the litestep core looks for aren't there. You've got to convert the themes to OTS2 if you want to use them. If you want to use the older themes you are gonna have to go with the older installer 2.7.X(get the newest one)

Or you can open the "themeselect.rc" file located in the "themes" directory and put it to the Default theme by replacing whatever is in there with the following like

This will get you at least an interface to use provided you did a full install and had the installer extract the default theme.

Now, to get that theme you want to work correctly, you will have to make it OTS2 or else contact the author and see if they are working on making it OTS2 compliant.

Hope that helps.