Zed sdk docs for older versions

Any idea on where can I get the zed sdk docs for older versions like4.1.2 as only this version is supported by my old jetson nano

You can select the API version on the bottom right of the ZED SDK API documentation page:

@Myzhar how do I find which zed sdk version is compatible with cuda 10.2 does zed auto detect and download or how does it happen?

You must read the notes on the download page of each version and download the compatible installer: