If you have upgraded from Numworks site, your calculator is locked
  and therefore partially incompatible with KhiCAS. Thanks to M4x1m3,
  there is temporarily a
  workaround to unlock your N0110 Numworks, 
follow instructions 
here.
  If the workaround fails (if you made an update from Numworks site
  after 22/03/28), the locking process is (almost) irreversible,
  the only known workaround for N0110 is explained 
    
here (French)
    it requires some additional hardware and opening the calculator (
beware
it does not work on N0115 and N0120).
   
    If your calc is a locked N0110 or a N0115 or a N0120
    you can still install a version of KhiCAS from
    
this page, but it will need partial reinstallation
    after any RESET or crash.
    
    If you install Khi+KhiCAS from this site, it will protect
    your calc against lock from USB connection.
    You will have to press reset and 4 simultaneously to open
    the bootloader in order to access flash.
    
Beware, don't do reset+4 or reset+6 unless you are sure to be
    on a safe site, if you do that on Numworks site, you might
    end up with a locked calculator.