In case the message "Can't open because the developer is unconfirmed" appears to Mac users
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Click the "Click to change" button at the bottom left of the screen. You will need to enter a username and password for the administrator account, so be prepared in advance.
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Select "Allow all applications" in "Perform downloaded applications".
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Selecting "Allow All Applications" reduces security. Click "Allow all Applications" as the warning will be displayed.
After changing the above, please install MetaTrader 4 again. After installation is complete, open this screen again and restore the original settings.