I don't know, but the only thing I could advice you to use free version of A8 for now, and if you'll succeed, then just update to COM version, which isn't really expensive. I don't know a thing about A6 c-script, I used the A7 version, which was a little bit different as far as I know (ent_move <-> c_move etc).
EDIT: if you do so, I can advice you to take a look at my website, I've made an example of movement, with smooth gravity and crawling, but I didn't implement jumping in it. Anyway, if you'll try to use it, PM me and I'll show how to implement a simple jumping part in it.