I just installed (and reinstalled) on my Mac (version 10.11.1) Lightroom CC 2015 as a trial version but it doesn`t work.
At startup it says: Cannot create the required folder: /Users/name/Library/Application Support/Adobe/Lightroom/Develop Presets.
I tried different solutions explained on your website but it doesn`t work. I work every day with PS and it works.
You need to change the permissions on the folder /Users/name/Library/Application Support/Adobe/Lightroom/Develop Presets so that it has WRITE permission.
Now it works! But I had to change permission to all the Lightroom folder (there wasn't yet any Develop preset folder) and set Read & Write to "staff" because "system" was already with Read & Write privilege. Thanks a lot!