The ArcObjects SDK is not a standalone public download; it is bundled with the main ArcGIS Desktop installation files.
Avoid “free download” websites offering the SDK. They often contain outdated, tampered, or malware-infected files. Esri vigorously protects its IP; unauthorized distribution violates the EULA. arcobjects sdk 10.8 download
Before you run the executable, ensure your environment is ready: ArcMap Must Be Installed: The ArcObjects SDK is not a standalone public
The ArcObjects SDK is not available as a public "free" download. To access the installation files, you must use the My Esri customer portal: arcobjects sdk 10.8 download
: The only official way to download the SDK is through the My Esri Customer Service portal.