iTunes 12: How to cycle through View Options with script/shortcut?
Use the select command to select the row.

tell application "System Events"
    tell process "iTunes"
        set frontmost to true 
        delay 1
        tell pop up button 2 of window 1
            click
            tell (select row 5 of table 1 of pop over 1) to click UI element 1
        end tell
    end tell
end tell