PTW is necessary ?

No. The PTW disk had some web content on it, which you don't get with C3C, but you can download all the scenarios, etc. you want from the CFC Creation & Customisation section.
 
C3C provides the MP function and some what better than PTW. You will be able to load any of the three versions after you install Conquest.

Not much reason to use C3 or PTW once you have C3C though.
 
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