From the WordPress Dashboard Home screen,
go over to the left-hand side and click Updates.
You're going to see any Updates
that are available for Plugins or Themes.
Also any updates that are available to the
WordPress core. You can check at anytime
for any updates. For demonstration purposes
I'm going to reinstall WordPress. You can
see that it is downloading now.
Checking the Update. It verifies
does the install and then brings you to
after it's done brings you to the welcome
screen of your point release.
This is WordPress version 4.2.2.
If you go back over and click on the Dashboard
and then Updates, you can see that it has
been reinstalled at this point.
You can also download the .Zip file.
You can go to your Update Plugins.
And then you can return to the
WordPress Updates. You can see now that
there are no Plugins that need updated.
The Themes that come with the default
install of WordPress can be updated.
You will see this message that the site
is in maintenance mode.
If somebody happens to go to your
website during this time, they will
see a message that the site is being
placed in maintenance mode for an upgrade
and will be available shortly.
It usually just takes a few seconds
up to a few minutes
depending on the speed of your server.
Returning to the Updates page,
you will see that everything is
up to date now. Point releases and security
releases are very important to update
as well as Plugin and Theme updates.