Hi,

I've written new plugin to update cloudfoundry/cli to the latest version.

https://github.com/tcnksm/cf-plugin-update-cli
(You can download it from my own plugin repo, https://t-plugins.au-syd.mybluemix.net/ui/ )

I think it should be implemented in cf/cli itself. But before that time, it will help you.
And It would be great if cf cli team provides SHASUM for each release binary on release page so that it can check it after downloading).

--
Taichi Nakashima