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In order to update Google Chrome, first select the three dots in the upper right hand corner of the browser window to open the menu and select settings.
Then, on the left hand side of the screen, select "About Chrome"
It should show this and give you an option to update if there is a newer version available. Once updates are complete it will show the "Relaunch" button to close and reopen Chrome to complete the updates.
If you are having issues with Chrome and would like some assistance, please feel free to reach out to the Tech Support team at 515-965-7300.