For the years we are users of CS6 Design Standard. Company need one workplace more and We took try expand license. For now we can find offer with software CS6. After order software we got answer, a producer refusal. And My question is, as being users of CS6 and expand our department of one more workplace with PC for designer we must using version CC ?
That's correct as CS6 is no longer sold.
With a Creative Cloud subscription you have access to CS6 as well as the most current CC versions.