The 1.1.2c update is just a software update. And two, you forget about the stand alone and vst and update to 1.1.2 c and run Keyscape from inside Omnisphere. One, you keep update 1.1.1d and use it as stand alone or vst.
Why? Because for the KG to be effective the dlls need to be patched. With update 1.1.2c you are not going to be able to run Keyscape as a VST or Standalone. With 1.1.1 d your stand alone and vst versions are going to work fine.
Everyone who followed the instructions was able to install 1.1.1d.