Re: I just bought Adobe Cloud Photoshop and didn´t get a serial number

You do not use serial numbers for Creative Cloud applications.  See the following:

http://tv.adobe.com/watch/cs6-creative-cloud-feature-tour-for-video/in stalling-desktop-apps-from-creative-cloud/

If you have the application installed and it is asking for a serial number, see the following:

Creative Cloud Reverts to Trial Mode
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http://helpx.adobe.com/creative-suite/kb/trial--1-launch.html