If I follow the official instructions on https://developer.nvidia.com/nvidia-sdk-manager and press the download button, I get a file called sdkmanager-0.9.12.4180.tar.gz of size 87M. The further instructions on that page assume I downloaded a .deb file.
However, if I follow the instructions on https://developer.nvidia.com/embedded/jetpack I get a file called sdkmanager_0.9.12-4180_amd64.deb of 63M. I will try the rest of the instructions with this.
Why the different files and file sizes? Is there a way to deploy the .tar.gz? It unpacks into a folder structure.