Disable check for update in 3.0.3 version

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I tried even that. When I click on checkforupdate button, it still search for update.

Well if you manually check for updates, it will still check for updates. That preference only disables the automatic check for updates that happen behind the scenes at the configured gui.update.interval interval for the configured gui.update.channel.

Is there a way to disable the manual process as well? I don't want the user to do manual update.

The only way I know to disable the manual "Check for Update"would be to modify the source code yourself to disable it. But what would that really accomplish? If the users have the ability to install software, then the users could simply check https://www.wireshark.org/ manually too and just directly download any new updates if they wanted to.

Thank you for clarifying this:)