I have an InDesign file in CC version, but I need it in a CS6 version. Write now I don't have my CC installation so how can I convert this to CS6?
I do not know how you expect anyone to help.
To open an InDesign CC file in a legacy version of the application, the file needs to be exported as an .idml file from Indesign CC. If you do not have inDesign CC, you won't be able to do this or open the file.
The only solution is to subscribe to InDesign CC, download the 30 day trial of InDesign CC and use that, or find someone to convert the file for you (which means they'll need all images and fonts related to the original file - careful of legal issues).