I am having the same problem, so cjscjs is not the only one.

I installed XLC.dll manually as you said in your instructions. When I open Excel, I get the error

Run-time error '1004':
Add method of AddIns class failed.

I do see the XLC toolbar at this stage but it doesn't work. Whenever I click on any of the buttons it asks me insert a hyperlink.

I then tried to install XLC.xll manually. At stage 3, I get the error message

'C:\Program Files\XLC\XLC.xll' is not a valid add-in.

If I close Excel and open it again, I still get Run-time error 1004.