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I really dont understand how it works .... just before the intro I get a message that the game cant load the data and than in the main screen I can't load anything from the previous game.

Any ideas ?

thank you very much !
I'm guessing you probably got it to work in the end. :)

I got the message as well about the load data the first time I started ToCS II, and was confused myself. In any case, just starting a new game allowed me to import the save game from ToCS I. I may of needed to exit the first time I started ToCS II after installing it, but I'm not sure if this is necessary for it to pick up the save game from ToCS I.