I think you'd be better to post this topic in the http://www.kerkythea.net/joomla/ website.
Have you already tried a test render to KT using KT2SKUP? It determines the path on the first run.
If you do have problems with KT, I can recommend stumping up for Twilight Render - it's very straight forward to use for SKUP users while retaining the power of Kerkythea.
Best of luck!
H