To check for the latest available version of Parallels Client for Linux:
In the main Parallels Client for Linux window, click Tools > Options.
In the Options dialog, click the General tab.
Click the Check for updates now button to see if a newer version of Parallels Client for Linux is available.
You can also select the Check for updates on startup option to check for Parallels Client updates every time you open it.
The rest of the options are described in the Configuring Global Options section.