where do i find sims 3 cad demo

@Aquill911  For the issue installing Dragon Valley, please see the first post of this thread:

https://answers.ea.com/t5/Store-Issues/Sims-3-Store-world-can-t-register-install/td-p/12619800

For the other, are you asking about a Create a Sim demo, or Create a Pet, or something else?  I don't know what the CAD Demo would be, but that's probably just a typo.

At any rate, the CAS demo was from Sims 4, the Create a Pet demo was from Sims 3 but is gone now, and I don't know of anything else similar.