Not found Deepstream source in jetpack 4.5.1

I’m just download SD Card image for Nano from here: JetPack SDK | NVIDIA Developer
Flash ok, i can get in OS
But i can not find Deepstream source, i also checked /opt/nvidia/deepstream. This is new in 4.5.1 jetpack? I have never met this issue before.
And where can i download souce Deepstream from?

**• Hardware Platform: Jetson
**• DeepStream Version: 5.1
**• JetPack Version (valid for Jetson only): 4.5.1
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

Hi subzeromot,

Please use below commands to install deepstream:

$ sudo apt update
$ sudo apt install deepstream-5.1