Maybe one image should speak for itself: here there is the dashboard of Multi-NewStatPress:

Here there are tree different sites that use Newstatpress: xyz, yzh, zhx

In upper position there is the information about the latest plugin version available (it is in blue color). Clicking on details will pop up the change log of this version, so you can read what is changed.

The program will look for the actual version of Newstatpress installed into each sites and colored them as:

• Green: it is up to date
• Orange: it is one version below
• Red: it is many versions below

Here, you can click in each site to access the plugin page and update that site!

Very simple 🙂