I have Kittel in my library. However, when I right-click and look up a lemma (ἔλαιον from James 5:14 in this case), Kittel doesn't show up.
Also, I can look it up in the LEH LXX Lexicon, but the link to Kittel (there abbreviated as TWNT) isn't going to the word in Kittel. (Other links to Kittel in LEH LXX Lexicon seem to be working).