After downloading the .tgz release files, helm plugin install is failing

[alireza-mht]

I am downloading helm-diff-linux-amd64.tgz file from release page. After untaring it using tar -xzvf ./helm-diff-linux-amd64.tgz , the command helm plugin install ./diff return the below error:

sh: 1: /home/alireza/.local/share/helm/plugins/diff/install-binary.sh: not found
Error: plugin install hook for "diff" exited with error

It seems that install-binary.sh file is missing.

plugin version: v3.8.1 helm version: v3.12.1