CS6 applications are supported however I do not recommend that you install Yosemite on an existing system as an in place upgrade.
You should deactivate the software, back up all of your data, and then proceed to do a clean install of the operating system.
After that you can install your applications and restore your data.
Thank you for your prompt reply.
I need to know where can I get the full Installer of CS6 Design Std working with Yosemite .
It is for news users working with Yosemite and who wants to install CS6 Design Std for the 1st time
The adobe support site is specifying only 10.8 and 10.9 as supported systems by CS6.