How to download and later install a Chrome plugin?

Some of our users use Chrome as their browser. I’ve recently received the quest from one user to install a particular extension (a password plugin) in his Chrome browser. The user itself cannot install the extension, because it cannot be downloaded on his computer (due to internet access restrictions).

I’m not a Chrome user, so I thought I could simply download the plugin and install it on the user’s computer. But when I visit the page to download the plugin, I can only add it to my own Chrome browser (which is not what I want).

How can I download this plugin and install it in the browser of this particular user?

Thanks!