Checking for updates and getting them is very simple.
There is a "Check for updates" button on the home screen.
When an update is available, the home screen "Check for update" button changes to a blue "Update" button.
Click on the "Update" button. A window called "New version available" will appear, with an information about the possibility to download an update. This window also contains information about the new version with the latest news (under the link "latest news").
You can confirm the update by clicking on "Yes" or select "No" to download it later.
The installation will run automatically after it is downloaded.