Because of Mac OS X10.8 or later has enhanced the security, following dialog becomes occasionally when launching the installer which is downloaded from MIMAKI website.
Please follow instructions to continue installation in such a case.
1) Hold down Ctrl key and click the installer icon, then menu is popped up. Select [Open] in the menu.
2) Click [Open] button in the following pop-up.
3) Continue installation by following the instructions displayed on the screen.