Google Nexus 7 users can check for availability of latest updates using the option provided as part of the Settings.
Step 1: Tap the Settings option from the quick links.
Step 2: In the Settings screen, navigate to the System section and tap the About Tablet option.
Step 3: Tap the System Updates option under the About Tablet screen.
Step 4: This should display the below screen with details about when the last checked for update was done. And using the Check now button, you can find if there any latest software updates available for installation.