I have tried the "Help" and "Check for update". A message popped up "The update server is not responding, which means it might be offline at the moment, or the internet or firewall settings may be incorrect. Please try again later". I have also tried open the the "Preference" dialog box but could not find "update" under the "Categories" in the left pane. I would be grateful if anyone could help. I am a beginner when it comes to computer knowledge.
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