Besides the problem already mentioned here I had one more. Theme could be installed, though style sheet not entirely functional in preview, but any change I made in settings was never saved. Fix was to change a couple of settings in my hosts control panel (GUI for php.ini editing). Actually nothing to do with php but with an extension, hardening thingy called Suhosin. Well, before:
suhosin.post.max_vars = 200
suhosin.request.max_vars = 200
I increased both to 2048 and theme settings are now saved. Google for how to change, seems like a common "tweak" to increase default. At least new to my host.