During the "life-time" of a certain engine it is updated from time to time and thus exists in different versions.
Latest for A6 is A6.60 afaik.
With these updates there sometimes are language changes, like adding specific commands or changing the syntax.
Thus I cannot tell you if c_rotate works with every freaking A6 version but it definatly does with the latest and I'm almost a 100 percent sure that it works at least since A6.31

It must be at any A6, because all A5 commands (shoot,sonar,trace,...) were replaced by c_*.

I think my version is too "old". I need a higher version.

Can I upgrade Sybex versions or not?

No. You cannot upgrade Sybex versions afaik.

and why? Is this version cheapier as the Conitec?

Not sure if its cheaper. The features of the sybex version are equal to the extra edition of conitec as far as I know.
However when you buy your 3dgs from conitec you will be registered and get a personal key file.
That one is missing when buying a sybex version but you need it to update and is the only thing that makes your 3dgs version a "valid conitec" version.

So if you want the latest updates etc. you should buy a conitec version.

lol that was the biggest [censored] I ever heard.

100€ out of the window for a unupgradeable version although the conitec bound are so expensive as the sybex...

So why you have buyed your version from Sybex?

because I have nothing knowed about 3DGS. I buyed it before I knowed how to programming games. I didn't know that a script controls a game. I learned all thank 3DGS. But at the buying I was very very knowless about all this...

I wanted to create my own game and searched for a what you see is what you get editor. I buyed 3DGS beacause it was the only single gamecreator in the market in my little city.

Sybex is dirty for noobs who will get angry that they buyed it.

There are always some problems in our life...