The Check for Updates feature can be disabled by changing the registry string value NoUpdateChecking from 0 to 1 in HKEY_CURRENT_USER\Software\Nico Mak Computing\WinZip\UpdateCheck
If the same string value change is made in HKEY_LOCAL_MACHINE it will propagate to any new user profiles that may be later added to the same computer.
If you have any questions about this information, please submit a Technical Support ticket.
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