How to Update the upfront without enabling (bronze plan) already installed wpmu dashboard?

Hi,

I would like to know how i can update the plugin (wpmu dashboard itself) and theme (upfront) without enabling the site on WPMU dashboard, as i have bronze plan and only 1 site can be enable at a time.

If i want to update some website from the past, i have to switch and enable my website and i can update the stuff with single click.

What if i want to do it manually by downloading the updated version.

Usually i have to remove the installed version and have to add new theme / plugin.

Share your opinion.