I could not find Cayenne library to install it into IDE, please help
Hi @esam.zayed, welcome to the Cayenne Community.
Please follow the steps at this link to install the Cayenne Arduino Library. It should be searchable from within your Arduino IDE.
I found it but now I am getting an error message from CMD , I am using Windows,
Still not connecting after uploading the scketch although the arduino changed its lighting blink
What error message are you seeing? Could you post a screenshot?