2 hours! 2 hours and still I can't get this working!

I have been over and over and over the install instructions which are stupidly easy.
I have checked, double checked and even triple cheked everything over and over again but still nothing.

I am using:
zc 1.3.8a
PHP Version: 5.2.2 (Zend: 2.2.0)

The only thing I can thin of is that I am not setting the parameters correctly.

I have the store set up like this:

Cat 1
-- sub cat 1a
-- subsub cat 1b
-- products

Cat 2
-- sub cat 2a
-- subcat 2b
-- subcat 2c
-- products

I want to specify -

Cat 1 - buy 2 get 3rd half price
I tried $this->add_cat_to_cat(1b, 1b, "%", 100);

Cat 2 - Buy 5 get 1 free
$this->add_fiveforone_cat(2c);

Is this correct? If not, help?

Thanks in advance.