I believe I have found the answer to your question
Download the Headshot Morph 1000+ (these are the sliders you need to sculpt) and unzip the files. Place them at this path:
C:\Users\Public\Documents\Reallusion\Reallusion Custom\Actor\Avatar Control\When you're done, your folder will be like that:
C:\Users\Public\Documents\Reallusion\Reallusion Custom\Actor\Avatar Control\Headshot Morph 1000+\Embed\PackNow open Character Creator 4 and load a character. Go to the
Help tab and click at
Refresh Sliders
You should be able to sculpt now
Tell us if it worked anytime soon