In case the message "Can't open because the developer is unconfirmed" appears to Mac users
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.
Select "Allow all applications" in "Perform downloaded applications".
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.