if you're using the true KitKat launcher, it's from Google, which means it's free. There shouldn't be a "free" and "paid version" unless you are using a 3rd party launcher like Apex or Nova.
Anyway, in the true KitKat launcher, long press on an empty homescreen. A menu should pop up on your lower screen. Tap Widgets. A list of widgets will come up. pick the one you want, and press-and-hold it. Slide it to the right edge of your screen, and a new page will be added. Drop your widget wherever you want it. Done.
I've tried a few KitKat ROMs on my Galaxy Nexus, and this is the way the Google Launcher works for all of them. I haven't tried to see how many home screens you can create though.