In the Update pane of Parallels Desktop Preferences, you can set preferences for the frequency of the update checks.
Note: The settings available in this pane can be configured individually for each user of the physical computer.
The Check for updates section defines the policy for updating the Parallels Desktop software. By default, Parallels Desktop is set to automatically check for available updates once a week, provided that the Parallels Desktop application is launched and your physical computer is connected to the Internet. You can specify another interval for updates checking by selecting the necessary value in the Check for updates list. The following options are available:
Checking for new updates may take some time and if you do not want to have the process window on the top of your Desktop, you can hide it to the background. To do that, enable the Check in background option.
Select the Download updates automatically option if you want all new available updates to be downloaded at once without showing you the Download dialog.
You can also manually check for available updates at any time you want by clicking the Check Now button:
Restoring default settings
The Restore Defaults button enables you to restore the default settings for all options available in this pane.